Which set screw are you referring to? If it's the one that holds the camera, why don't you tap another hole or two to hold the camera more securely.
This is the weakest link in the chain, and it's easy to fix.
The focus lock screw shouldn't cause any problems - the linear guide rail won't have any play at all.
Quote:
Looks like I need a new focuser before I tackle collimation.
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I would collimate it before replacing the focuser, especially if you are worried about the expense. Also check if the primary is moving and collimated properly.
I had a robofocus on my, but I took it off. The focus never shifted from night to night, and it's easy to do manually anyhow.
James