So I recently bought a used 12 Zhumell Dob recently and have been having issues with the Azimuth knob loosening regardless on how much I tighten. I have read the mega thread and a few other threads where suggestions include, gluing down bumpy Formica, adding a central bearing and new bolt with finer threads, and adding Teflon, among others but I’m trying to figure out if what I have is usable.
When I removed the AZ knob I noticed some odd items. The knob itself was filled with glue; presumably to keep the bolt attached to the knob. There was a split lock washer with the split glued / epoxied smooth; this looked to be done intentionally but would seem to defeat its purpose if it was to provide some spring resistance. There were also 2 smooth stainless square sheets on each side of large round bearing; I’m not sure if a lazy Susan requires all three parts but I have not seen any similar designs to mine on the web.
See attached: the spring washer was glued smooth, unless it leaked through when the knob was glued to the bolt. The large wheel appeared to roll well, nothing broken, and you can see the ware marks in the center and under the large wheel.
So what are the steel plates for and is there any advantage to leaving them as is? If I leave them what else would be beneficial to getting the right movement? Would replacing those knob washers stop the loosening AZ knob?