Hi Noger...+1 on vtornado's suggestions. I recommend taking the base boards apart and having a good close look at them. The mechanism is really pretty simple. Just two round melamine covered particle board plates that slide against each other with bits of teflon separating them. Something has to be hanging them up. Check the assembly diagram carefully. Maybe a part is missing like a washer or a sleeve. The two plates should move freely but not glide either. There should be a little drag or you will be over shooting your target at the eyepiece. Good luck!
Edited by sevenofnine, 29 January 2023 - 07:09 PM.