Originally Posted by
repechage
I have not followed the later versions of Simplex seat post, I can see how that design would be easier to assemble but less effective.
The assembly really depends on the center spacer to transmit the counter force from the bolt, and the nut potentially might just dig in more rather than keep the system tight….
I would consider a brass shim washer to provide a tight fit for the hourglass shaped spacer, maybe even going as far as to dress the inside of the clamps to increase their surface area in contact with the "hourglass". And a grade 8 metric allen head cap screw in place of that OEM bolt.
Or, locate an earlier Simplex post
Or, admit defeat and go Campagnolo.
Right now it is a Campagnolo post on the bike. But I am wanting to go "tout Français". The shim idea gave me an idea, but I don't know if it is feasible. A star washer if it is thin enough. This along the line of ExPres' idea of folded sand paper. Will play around with it later. Looks like this weekend may be a washout.