Thrust bearings come in inconvenient sizes, for my purposes anyway. The closest size was far too tight, the next size up allowed too much slop. So, to take up the slop I made a bushing, but without a lathe (as I don't have such a thing). I cut off some steel tube, slit it and widened it, made a platform out of a slip of box section (to accommodate the weld connecting the collar to the box), fitted that round the collar (which slides up and down and round the pillar), allowing room for the slit tube, then after hours of grinding and filing, fitted the tube around the collar and inside the raised platform, welded it in place, plug welded the platform to the box and fitted the bearing sandwich with room to move but minimal slop, and made a sheet steel super-washer to sit the spring base on.
All told, it works well.
The raised platform absorbs the weld fillets so that the spring will sit on a turntable which is flat.
Ready for the top bearing washer and the spring base washer. Then the spring.
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