The focusing is just screw threads machined into the rear housing and on the front barrel. They are always loose and there is slop, so nothing to do other than get used to it. Sometimes a thicker grease can help. To do thta, you need to pull the tripod plate from the bottom and back out a screw hidden under it, then the front section can unscrew all the way.
The other cap screws on the side are for covering the holes where the fork mount for the C90 Astro version attached. The single cap screw opposite from that was for screw in counterweights to help with tracking (the fork was a one arm and unbalanced)
Dave
The other cap screws on the side are for covering the holes where the fork mount for the C90 Astro version attached. The single cap screw opposite from that was for screw in counterweights to help with tracking (the fork was a one arm and unbalanced)
Dave