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Getting both surfaces really clean seems to make more difference than keying the metal surface, although a wipe over with some abrasive paper won't do any harm. The Tester Kitchen is always equipped with a big bottle of IPA, for use after any filing/sanding
This kind:
Not this kind:
You can use a pretty fat glue layer with 2-part epoxy, and with the bung I sent you (not the one I'm sending Scilly), you can put a bead around the top to add even more pull-out resistance.
You should be able to get your headset preload dialled in with modest finger pressure on the short arm of the Allen/Torx key, if you're using more than that there's a good chance your top cap is bottomed out on the steerer projection and you either need to trim it or add an extra spacer between top cap and stem.
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gbj_tester
My Tester stem bung worked really well until I tried to reglue it and filed it for extra adhesion and now it slips, recommended (obvs don't file yours)