I've just acquired myself a Klein Mantra frame - to be precise, this one <URL:http://cgi.ebay.co.uk/ws/eBayISAPI.d- ll?ViewItem&item=3667944572> to experiment with. I've got a few wee problems I need to sort before I can get it going.
The most serious is that the seat post clamp has an allen bolt rather than a quick release, and at some point someone has used the wrong size allen key and rounded off the flats. The bolt is also jammed and I can't turn it. I'm tempted to take an angle grinder and slice through the bolt, but I can't tell whether the seat tube clamp is integral with the frame or not. If it is I would look bloody stupid because I would then have a seized thread in there I would have no way of getting out. Does anyone know for a fact whether the seat tube clamp on a Mantra is integral?
"Simon Brooke" <[email hidden]> wrote in message "]news:[email hidden]...
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I've just acquired myself a Klein Mantra frame - to be precise, this one <URL:http://cgi.ebay.co.uk/ws/eBayISA- PI.dll?ViewItem&item=3667944572> to experiment with. I've got a few wee problems I need to sort before I can get it going.
The most serious is that the seat post clamp has an allen bolt rather than a quick release, and at some point someone has used the wrong size allen key and rounded off the flats. The bolt is also jammed and I can't turn it. I'm tempted to take an angle grinder and slice through the bolt, but I can't tell whether the seat tube clamp is integral with the frame or not. If it is I would look bloody stupid because I would then have a seized thread in there I would have no way of getting out. Does anyone know for a fact whether the seat tube clamp on a Mantra is integral?
I'd be tempted to cover the whole thing in a liberal quantity of WD40, plus gas or similar, then take a hacksaw to it and cut a slot in the end of the allen bolt, then unscrew it with a big screwdriver. If you're feeling flush you could do it with dremel cut off disks, but they don't last long on anything very heavy. Did a similar thing on a much smaller scale with a rounded aluminium screw on some shifters t'tother day and it works fine.
I'd be tempted to cover the whole thing in a liberal quantity of WD40, plus gas or similar, then take a hacksaw to it and cut a slot in the end of the allen bolt, then unscrew it with a big screwdriver.
Plus gas then the angle grinder to cut a slot and then a great big screwdriver should work.
I've just acquired myself a Klein Mantra frame - to be precise, this one <URL:http://cgi.ebay.co.uk/ws/eBayISA- PI.dll?ViewItem&item=3667944572> to experiment with. I've got a few wee problems I need to sort before I can get it going.
The most serious is that the seat post clamp has an allen bolt rather than a quick release, and at some point someone has used the wrong size allen key and rounded off the flats. The bolt is also jammed and I can't turn it. I'm tempted to take an angle grinder and slice through the bolt, but I can't tell whether the seat tube clamp is integral with the frame or not. If it is I would look bloody stupid because I would then have a seized thread in there I would have no way of getting out. Does anyone know for a fact whether the seat tube clamp on a Mantra is integral?
Why not email Klein if nothing shows up here? I have a pal who had one, I'll email him. Cheers Graham
"Doki" <[email hidden]> wrote in message "]news:[email hidden]...
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Simon Brooke said:
in message <[email hidden]>,
Doki (') said:
"Simon Brooke" <[email hidden]> wrote in message "]news:[email hidden]... > > The most serious is that the seat post clamp has an > allen bolt rather than a quick release, and at some > point someone has used the
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Crikey. I'd be tempted to ask in uk.rec.cars.maintenance, as there are generally a fair few questions there about getting siezed studs out of engines and so on. There are special tools you can use, which AFAIK are a special drill bits which drill in normally, then dig in when you reverse
the
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drill, however they're generally seen as being useless on a lot of car stuff, but it's likely a bike seatpost clamp was torqued up with an allen key rather than a foot long ratchet.
Stud Extractor. It looks a bit like a square pyramid but very thin and tall. About two or three inches long. During manufacture it is twisted into a lefthand spiral.
The bolt must be drilled down the middle and then the extractor is screwed into the hole until it jams in tightly. Once it jams in you keep turning it and being a LH thread it should unscrew the bolt. If it snaps then you will really have a problem as it is too hard to drill with ordinary tools. Paul.
Stud Extractor. It looks a bit like a square pyramid but very thin and tall. About two or three inches long. During manufacture it is twisted into a lefthand spiral.
The bolt must be drilled down the middle and then the extractor is screwed into the hole until it jams in tightly. Once it jams in you keep turning it and being a LH thread it should unscrew the bolt. If it snaps then you will really have a problem as it is too hard to drill with ordinary tools.
That's the one. My understanding is that they snap often enough to make them a bad risk when you're faffing around with car stuff. Whether bike stuff has less time to corrode or gets torqued up less, I've no idea.
