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bobble
Re. seatpost slipping (aside from obvious answer that you might not have tightened it up enough) I’ve had problems in the past with seatpost clamps on thin walled steel frames where the “lip” of the clamp that stops it slipping down the seat tube is too thick compared to the diameter of the tubing and prevents it from clamping the seat tube.
For instance I found a brand-x one would always slip but tester approved BBB bsp-85 hasn’t budged.