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Some combination similar to this
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I'll @ you in the thread where I posted photos and someone made a gif of my technique that has never failed.
As for repairing your broken whips, definitely. Infact, I don't think I've ever owned a whip that I haven't replaced the chain on (handy tip, collect up those bits of expensize Izumi Supertough chain that people throw away for the ultimate chainwhip).
I like to use split links to put chain back onto whips as it can be difficult/impossible to get the chain tool in place and IME split links are stronger than rejoined links.
The type with the spring clip are best for whips.
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try heating the sprocket if possible with a blowtorch, let it cool then try again. If there's any threadlock then it should weaken it. If that doesn't work try gt85 or another penetrating oil and let it soak in for a while. Still no joy then try the rotafix method. I've had this same problem and it shows how useful a chain whip is that uses an actual bike chain than can be replaced, a lot don't.
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freezing77
M_V
Sumo
@Buildhigh
trying to get a cog off the track hub, (yes trying to unscrew anti clockwise), gone through 2 chainwhips already, as in the chain deforms and snaps....(can these be repaired?), any other methods? dont want to destroy the hub as its a nice Paul one.