raleighnut
Legendary Member
- Location
- One of the 'Elite'
Do you mean the allen bolt head is rounded out, if so follow the advice of @Arrowfoot
this is the ofended head bolt
Head cap bolt sheared
- Thread starter Snorrarcisco
- Start date
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graham bowers
Guru
- Location
- NW Leicestershire
Well, it looks to me like the hex socket in the screw is just rounded off, not thread or shank damage at all. If so you are in luck as what could have been a 5od of a job just got a lot easier. So, the 50K$ question. Is the problem that allen key is just spinning in the destroyed hex hole, or is the black part that immediately surrounds the hole turning with the allen key and the problem is below??
If its a rounded hex in the screw, you could whack in a torx bit as the video suggested, but you may be able to get by with a conveniently sized flat blade screwdriver whacked in - that would be the first thing I'd try, even if you have to file the screwdriver blade to make it a suitable size. An old timers dodge for this type of job was to whack in the tang of a file, by the way. Basically, anything whacked in that you can use to apply torque. As was mentioned earlier this thread, that screw should not have much torque on it.
Alternatively, if you have a dremel, or know somebody who has one, with an appropriate cutter you could machine in a slot that a screwdriver could engage with.
And if it is just a rounded hex socket, drilling it out becomes much more feasible as it won't spin.
For completeness, I should mention a clever little bu99er called an easyout https://en.wikipedia.org/wiki/Screw_extractor
Graham
PS this may appear in duplicate as it didn't post the first time.
If its a rounded hex in the screw, you could whack in a torx bit as the video suggested, but you may be able to get by with a conveniently sized flat blade screwdriver whacked in - that would be the first thing I'd try, even if you have to file the screwdriver blade to make it a suitable size. An old timers dodge for this type of job was to whack in the tang of a file, by the way. Basically, anything whacked in that you can use to apply torque. As was mentioned earlier this thread, that screw should not have much torque on it.
Alternatively, if you have a dremel, or know somebody who has one, with an appropriate cutter you could machine in a slot that a screwdriver could engage with.
And if it is just a rounded hex socket, drilling it out becomes much more feasible as it won't spin.
For completeness, I should mention a clever little bu99er called an easyout https://en.wikipedia.org/wiki/Screw_extractor
Graham
PS this may appear in duplicate as it didn't post the first time.
OP
OP
Snorrarcisco
Regular
- Location
- Kent
Cheers for the help guys will look into it and see what i can make of it.
graham bowers
Guru
- Location
- NW Leicestershire
How did it all pan out??
Smokin Joe
Squire
- Location
- Bare headed cyclist, Smoker
No way you should round the head of the top cap bolt unless you are seriously over-tightening it.
graham bowers
Guru
- Location
- NW Leicestershire
Remember, the bike in question was second hand, so there is no knowing what sort of abuse it has suffered in the past, but a scenario that fits could be:
1) Low screw made of cheese.
2) Using the wrong allen key, too small.
3) Not loosening the clamp bolts, so being tempted to apply excessive torque.
biggs682
Itching to get back on my bike's
- Location
- Northamptonshire
yep that looks like it has lost the corners ok , it should come out ok
OP
OP
Snorrarcisco
Regular
- Location
- Kent
Havent come around to sort it yet - been lazy and Christmas got me into baking mood I didnt even cycle that much almost had an off the bike onto the cow field incident... too quick too heavy sloppy brakes!!!!
Tom B
Guru
- Location
- Lancashire
Bash in a slightly oversized Torx Bit and remove.
Replace with better quality bolt.
Replace with better quality bolt.
