Stuck chain ring bolt...

[Kell]

I've just tried to remove a chain ring bolt on one of my bikes (it's actually the Brompton) and can't get it off.

As I'd imagine many of you have dealt with seized parts, you might have a solution I’ve not thought of yet.

The problem is that the slot on the reverse had rounded off, so I can’t get the correct purchase with the tool. Tried gripping it with mole grips, but the profile is too shallow and they just keep slipping off.

I’ve thought about going at it with a hacksaw and putting another groove in at 90 degrees but the design of the bike makes it hard to access. The other option was to get my missus to hold an allen key in place while I hit from the reverse with either a chisel or screwdriver – just something to give it purchase against.

If this doesn’t work does anyone have any better suggestions?

 

[unkleGsif]

Re:

Plusgas to soak it

 

[longbeech]

Re:

Drill it out - A new on is cheap as chips and you cant use the existing one again anyway,
Cheers

 

[legrandefromage]

Re: Re:

Drill it out - A new on is cheap as chips and you cant use the existing one again anyway,
Cheers

What he said - I do it all the time

 

[Kell]

How do you stop it rotating as it's drilled though?

 

[Kell]

I should've mentioned that it half undid before the back rounded off.

So it spins round, but I can't tighten or loosen it.

 

[dyna-ti]

I'd try option B, with the g/f holding your key and you hammering away at it.

 

[longbeech]

Re:

Use a large dia drill with an allen key half way through as soon as the head comes off it will slide right through.
Cheers

 

[longbeech]

Re:

Ps: allen key from the back!

 

[Kell]

Thanks all.

I'm away this weekend, but I'll give that a try when I get back.