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Allen screw size on GSO 2" Crayford Focuser for Refractors - Dual Speed (with 96.6mm Telescope Adapter)

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#1 Shane1200

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Posted 25 February 2021 - 01:30 PM

I discovered this morning one of the four allen screws on the top of the focuser next to the telescope is missing.   Does anyone know what size allen screw it is? I want to avoid having to remove one the remaining screws and take the chance of losing it when I go to the hardware store. 

Thanks. 



#2 rk2k2

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Posted 25 February 2021 - 02:30 PM

Can't say for the actual screw but mine uses a 2.5mm drive.  According to bolt depot a socket button screw (which it appears mine is) that uses a 2.5mm drive would be a 4mm.



#3 Shane1200

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Posted 25 February 2021 - 05:02 PM

Thanks for answering. 

I contacted the vendor who sold me the focuser.  

 The focuser uses a  Set Screw with Hex Socket, Flat Point, M4 Thread requires a 2mm hex socket. 

https://agenaastro.c...-set-screw.html



#4 SteveG

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Posted 26 February 2021 - 12:25 PM

Https://www.boltdepot.com/fastener-information/driver-bits/Metric-Allen-Drive-Driver-Sizes.aspx




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