Bristol set screw?

[maryramp]

I read a helpful thread on this forum dated 2019 regarding maintenance of the Questar clock drive and base which referenced the set screw that secures the nut on the top of the base. It is apparently a Bristol set screw but the size isn't mentioned. Can anyone tell me the size? Also, it appears from the tight quarters of the nut that the Bristol wrench would have to have a very short arm in order to reach the set screw. McMaster Carr probably carries the part; can anyone supply me with a part number? Thanks for your help!

 

[iuliubigger]

I cannot tell you the size, but you can probably find it in the technical documentation from the telescope. You can find it on the official website or in other open sources on the Internet.