Pat,Dave, When I read your posts, it reminded me of a piece of equipment we built for an auto assy plant some time ago. We employed the same type of pipe-on-pipe method described and tried the biased cut on the outside pipe for an "auto-return" feature. Too much friction with the pin. Ended up with a cam-follower instead of the pin. Don't recall the angle of the cut for a smooth, non-lethal return function. May have even added bearings to the pipes, can't recall for sure. Worked slick.
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