I know you've done this... but I think it just needs a bit more persuasion (ie force). It's a bit disconcerting to hit your carbon bike with a hammer, at first. But it should really come out. If you don't get it out... it's only going to get worse. galvanic corrosion and scaling could even split or crack the carbon in that area if you don't get it out and cleaned up.
Briscoelab wrote:Sometimes you need to guts to use a hammer. Spray some silicon lube or penetrating oil around the nut from both sides, thread a bolt in from the back and hit it.
I know you've done this... but I think it just needs a bit more persuasion (ie force).
I agree. Just give it a couple of strong taps with a rubber hammer and keep on going until it comes loose.
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Otherwise drill out the nut being careful not to drill the carbon...
If it still is stuck, then i think it's glued in.
Hammering, wd40 and heat is no good imo
In the end I just had to screw the brake in and use a spacer so that it ended up the right way round. Hopefully this will work, it is screwed tightly in.
I suspect it would irritate me that this was not right, particularly on this frame, with those wheels and the obvious level of detail you are aiming at. Even the invisible bits on a bike should be right !
The bolt is free to move along its channel, but just not leave the frame - that is what appears by comparing your recent picture from earlier ones. Is that right? In this case, I think there it is just an abnormally tight fit.
I can understand why you would be nervous to whack too hard, and to chip paint away around the brake mount hole. It is also not the easiest place to drill. If you can access it though, I would certainly give it a go; Once the central core is drilled out, there is always the tendency for the remaining metal to peel away.
The bolt still doesn't move at all. I wanted to try and attach a bolt from the down tube side to try to extract it. Although the hex bit was rounded the bolt still wouldn't fit so I drilled from the outside with a bit smaller than the diameter of the threads and 'wiggled it about a bit' to try to enlarge the hole sufficiently. That is why it looks such a mess in the latest pic but it still wasn't wide enough to get a bolt in.
I'm not sure about drilling it out. The down tube doesn't allow enough space to get in and if I went from the other side I'd have to drill part of the frame first.
How cold would it have to be to loosen the bolt?
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