Matt, Welcome.
Your description is perfect. Remove the four screws as in pic. Remove shaft & take out the focuser tube. Look inside to make sure that the teflon slides are flat & not twisted or doubled up somehow. The teflon & tube must be clean & dry. Do not lubricate with anything. Before you put the focuser back together, make sure that the tube slides easily/smoothly with no sticking action. Clean the glue/grease off the R&P, & check for missing teeth. Re-assemble,(I used a light smear of vaseline on both parts), & carefully adjust the screws to just apply enough tension so that there is zero backlash. IF the tube still rocks up & down, then you will have to repack it with new thinner teflon, till there is none. I had to do this when I made my electric focuser. Now I have zero image shift & no backlash.
As already said, if you're not sure how to, then ask someone from 'your' Canberra Astronomical Society to help.
HTH.
L.
ps. The 'GLUE' we refer to, is the original grease that they use. It may as well be glue, cos it ain't grease.
L. This just wipes off with turps/metho.
pps. Ask CAS members re; thin teflon tape. This can be stuck on with thin double sided adhesive tape.
