Like David suggested, I used brass shim stock to take up the slack from worn or disappeared nylon shims. You can 'adjust' the tightness with shims by squeezing the outer section with big vice-grips. I have also (if requested) drilled a hole thru for a mild steel cotter pin (or even a bent nail!) This locks the sections together but will shear if a big enough impact happens that would have made the collapsible section work.
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