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I got my first bike there in 1982, a red burner Bmx. Still go in there from time to time. The dad died a couple of years ago but it still seems fairly busy.
They have been reorganising the left hand side of the shop, and have operating out of the right hand side for the last two months, until they can put the whole shop back together again.
My guess is they are choosing the quietest week of the year to finish off the building work.
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The stem is painted so perhaps the welding has taken place between the stem and the wedge, not the stem and the fork.
Still, if you hit it hrs enough it should budge eventually. I would use an upside down bolt as a punch. I would also give up if it was driving me mad,
- You should only unscrew the bolt a couple of mm so its still properly connected to the wedge..
- You should only unscrew the bolt a couple of mm so its still properly connected to the wedge..
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....it didn't drop down.
...So,the wedge is probably still wedged? Until you free the wedge then the stem can't move.
If the bolt rises but does not clear the top of the stem then i can see why you might want to use a punch. Maybe another bolt the same diameter might spread the load more if you use that as a punch. I don't feel like we've got to the bottom of this yet.
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BTW, I dont quite understand why you you've been pummelling the bolt in after it has free'd up the wedge.
You used a nail punch? Either the bolt and wedge i free or its not..So, to recap, you unscrewed the bolt a few turns and it rose out of the stem. You whacked it and it dropped down again.. Job done.
Why the nail punch?
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At this point, I would cut it off... You'll spend about £10 and quite a lot of time sorting it out with caustic soda, but at least you know it will work and you wont risk damaging your forks or your frame.
You can cut through aluminium quite easily with a hack saw, the steel bolt in the middle is tougher but its pretty thin. Maybe give it 24 hours just to check noone else has a better idea.
If it was me i would get right on it. Stems are much easier than seat posts so you're lucky in that respect..
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Its also worth checking the stem bolt and wedge.
When you unscrew the stem bolt, the wedge will be wedged, and so the bolt will rise up out of the stem. If you tap the top of the bolt then it should dislodge the wedge.
If the wedge is free and the stem is still stuck then i would destructively remove the stem as above..
Edit: Sorry I've just seen you post above while i was writing this.. I reckon it might be jammed in.
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Ive had this problem and its always the alluminium stem 'welded' into the forks with rust or some kind of galvanic wizrdry. Here is a solution which works every time for me.
Destroy the stem by cutting it off with a hack saw so you can then remove the forks. Next get a 2litre coke bottle and cut the top off so its big enough to drop the (upside down) forks in later on. Fill it with water and then pour in plenty of sodium hydroxide crystals. The solution will heat up as the crystals dissolve.
(Warning: this is dangerous chemistry, do it outdoors and wear protection. Always pour the powder into the water not the other way round.)
Clamp the forks in the coke bottle so they can be left there safely for 12 hours.
Sodium hydroxide is a strong base and will remove the oxide layer from the alluminium stem. The water will then react with the (highly reactive) alluminium metal underneath and slowly your stem will dissappear. The steel forks will be unaffected.
Repeat the process until you have no stem left.



Ive got some ok tyres that would go nicely with this..
Have you got any pictures of them?