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A shim is a shim is a shim
...ish
Is the slot in the shim still open when everything is tight? Is the shim cold rolled (hard smooth surface with no grip) or turned (soft, rough, grippy)?
Anyway, shims aside, it should be possible to get enough pull-out strength on a glued in bung, so as you suggest your bond is the problem. Mine have less bond area and hold 5Nm of post-assembly belt-and-braces over-tightening. Stick it in your drill chuck and give it a good linishing with coarse grit paper, you're probably looking to remove about 0.005" on the radius to go from a light interference fit to a decent clearance. Spread the glue on both surfaces when you get to that stage of proceedings.
gbj_tester
That is also a problem: even when the bung has held long enough to allow proper assembly, the HS eventually develops play.
Assembly paste on either side of the shim, which I hold open when fitting, and torqued to the max. recommended.
A shim is a shim is a shim, so not sure what else I can do (aside from a 1" stem).
However, the photo above is the result of assembly only, no riding. Presumably I reached 2.5Nm when the bung hit the top cap.