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coventry_eagle-
The conical wedge might have worn out.
Try swapping that out first?
That is a very logical suggestion, thanks B
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The conical wedge might have worn out
If it doesn't pull through, it's doing its job. Cone type stems do rely on the shaft being quite close in diameter to the steerer bore, if it fitted with powder coat in the bore then it's a bit loose now.
Skülly
gbj_tester
Possibly i may answer my own question here, guess I'm just asking all if there's an obvious pratfall I might miss in my plan that might mean I fuck up a difficult-to-replace part.
Problem:
Pedersen from '94 I rebuilt a few years back... integrated bars and stem (i.e. they're brazed together for a zero-mm extension... the stem vertical is brazed into the bars, there is no horizontal part to the stem).
The interface with the steerer is an old type expander, not the quill ended type. So the stem has a split near the bottom, and the long bolt pulls a conical wedge up the stem to push the flanges outwards, these 'grip' the inside of the threaded steerer.
The HUGE fork out of the bottom of this steerer, once any kind of significant load on the fork (front rack) makes the interference of the stem with the steerer slip. Initially I had powdercoat all the way down the stem (what a dumbass I never got the painter to mask it). Now I have stripped the paint I am still finding the raw steel on steel isn't enough to really grip the fork enough to stop slippage.
Would I be bonkers to cut the slit section of the stem off, at a wedge, and use a quill instead?