900 Upgrades & Parts

Astro-Physics

GTOCP4 Control Box for all GTO Mounts, except Mach2GTO. Order new 2-Pin power cable (GTOCP4)

All GTO mounts(except the Mach2GTO) produced since 1998 can be easily upgraded!!! The GTOCP4 Up

Astro-Physics

GTO Keypad with Keypad Protector - for GTOCP1, GTOCP2 and GTOCP3 Control Boxes. Serial # of mount required for purchase. (KEYVFK)

This Keypad should only be purchased for use with the GTOCP1, GTOCP2 and GTOCP3 control boxes. This

Astro-Physics

GTO Keypad with Keypad Protector for GTOCP4 and GTOCP5 Control Boxes. Serial # of mount required for purchase. (KEYVFK2)

This Keypad should only be purchased for use with the GTOCP4 and GTOCP5 control boxes with version P

Astro-Physics

Right-Angle Polar Alignment Scope Adapter for 900GTO Mounts (RAP900)

Special note regarding a select few 900 mounts:      Please check this linked photo t

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Threaded Cap for Right-Angle Polar Scope Adapter (M16106-A)

We are making this cap available separately as a spare in case you lose the one included with the Ri

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EPROM Microcontroller Chip w/ V2 Version Firmware for GTOCP3 Control Box, Extraction Tool (CHIPKITV2)

If you already own the GTOCP3 control box, you may wish to consider upgrading the ROM chip to take a

Astro-Physics

Flat Surface Adapter with Flat Pier Plate - for 1100 and 900 Mounts to use 10" ATS Piers (119FSA-10ATS), inside surface not anodized

Ever find yourself wishing that you had a bigger mount? Short of a magical spell, you can maximize t

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Pier Adapter Knob Kit for 900 Mounts (9KBKIT)

This kit contains four machined and black-anodized Pier Adapter Knobs and 1/4"ID x 1"OD flat washers

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Standard Pier Adapter for 900 Mount, Fits 8" Astro-Physics Piers (900SPA)

The 900SPA is a replacement for your 900 Standard Pier Adapter if yours is damaged. The base is 7.73

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Counterweight Shaft Adapter with Aluminum Bronze Insert for 900 Mounts (see exception) and Mach1GTO Mounts shipped before July 2014 (S900CSA)

If your 900 is frequently used as a portable mount, you may wish to consider upgrading to this count

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Counterweight Shaft Safety Stop, One-Piece, Washerless (M12676)

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9.25" x 1.875" Diameter Counterweight Shaft Extension, Stainless Steel (M12675)

The 8.5" Counterweight Shaft Extension completes the current 1.875" diameter counterweight shaft ens

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37" Dec Cable for GTOCP1 and SMDCP1 Control Boxes of 1200GTO or SMD, 900GTO or SMD (SRDC37)

This 37" replacement cable is available if you damage or lose yours. Mounts that can use this cable:

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12" RA Cable for GTOCP1 and SMDCP1 Control Boxes of 1200GTO or SMD, 900GTO or SMD (SRDC12)

This 12" replacement cable is available if you damage or lose yours. Mounts that can use this cable:

Astro-Physics

Machined Safety Stop Knob. 5/16"-18 thread - For 1.125" Diameter Counterweight Shafts. (MSSKB)

You asked for it … now we’ve got it! The Mach1GTO’s counterweight shaft is now &

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Polar Alignment Scope Plug Adapter (M4037)

This adapter threads into the rear of the right ascension axis of the mounts specified below to allo

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Flat Surface Adapter with Flat Pier Plate - 1100GTO and all 900 Mounts - for 8" ATS and other non-Astro-Physics piers (119FSA-FP), inside surface not anodized

If you are ordering a 8" ATS pier for your 1100GTO, you will need to order this adapter to interface

Astro-Physics

Flat Pier Plate for 1100GTO and all 900 Mounts - for 8" ATS and other non-Astro-Physics Piers (119FP)

This Flat Pier Plate (119FP) has been machined to the specifications of the Advanced Telescope Syste

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16.975" x 1.875" Diameter Counterweight Shaft , Stainless Steel- 1100, Mach2, Mach1, 1200, 900 (see exception) (M9404-B)

This is the current shaft for 1100 and 900 mounts. It can also be used as an optional "heavyweight"

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22" x 1.875" Diameter Stainless Steel Counterweight Shaft - 1600, 1100, 1200 (all models), 900 (see exception). (M12601-E)

Like its predecessors, this 1.875" diameter counterweight shaft is precision machined from solid 303

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Flat Surface Adapter -attach 1100 Mount or 900 Pier Adapter and Wedge to a flat surface (119FSA), inside surface not anodized

The 8” Flat Surface Adapter (119FSA) allows the 1100GTO Mount and all versions of the 900 Moun

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Polar Scope Cover for 900GTO Mounts shipped since October 2005 (Q9700)

These covers allow you to keep your Polar Alignment Scope protected while remaining threaded in your

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Cover for Back of RA Axis for 900GTO Mounts shipped since October 2005 (M9403)

This sight hole cover threads onto the back of all 900GTO mounts shipped since October 2005. The re

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5/16-24x1/2" Flat Point Set Screw to Use in Place of RA Clutch Knobs-900 Mounts (F0021)

If you operate your mount remotely and are concerned about cables snagging on the RA clutch knobs, y

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Altitude Adjuster Assembly for 900 Mount, all models (9ALKIT)

Individuals who own the very earliest 900 mounts may want to consider upgrading to this more substan

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Altitude Adjuster Brace for 900 Mount, all models (9ALBKIT)

If you do not wish to replace the entire Altitude Adjuster Assembly with 9ALKIT, you may wish to con

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Replacement for 900/1200 Dovetail Knob (DOVEKREP)

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90-Degree Dovetail Adapter Plate for 900/1200 RA- mounted GTOCP4 (CBA912KIT)

If you wish to mount the GTOCP4 between the forks and use the original Y-cable supplied with the mou

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Y-Cable for 900GTO Mount -for Pier-mounted GTOCP4, GTOCP3 or GTOCP2 Control Boxes (SGYCR2345)

We recommend this cable if have a 900GTO and your GTOCP4 is mounted on the Control Box Adapter (CBAP

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Y-Cable for 900GTO Mount with GTOCP4, GTOCP3 or GTOCP2 Control Boxes that are mounted on the RA housing (S900GYCR)

If you are upgrading your 900GTO from the GTOCP1 Control Box and plan to mount the control box on th

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900GTO Quick Release Control Box Adapter Kit - upgrade from GTOCP1 Control Box (9CBKIT)

If you are upgrading your 900GTO from the GTOCP1 and plan to attach the new control box to the RA ax

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Adapter to attach Losmandy HD Tripod or Tripod with Losmandy MA Top to Astro-Physics 400, 600, 1100, 900, Mach1 and Mach2 Mounts (LT2APM)

This adapter allows owners of all 400, 600E, 900, 1100, Mach1 and Mach2GTO mounts (cannot be u

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Power Cable Set with 2-Pin and Powerpole Connectors for GTOCP4 and GTOCP5 (CABPP4SET)

The power cable for the GTOCP4 or GTOCP5 (Mach2GTO only) can purchased as a set or the individual pa