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You know, I've found a lot of mentions of using a hammer/dolly to do this with a torch, and I found that it was necessary when I tried it with a torch (again, I tried a largish map torch, I found that propane couldn't direct enough heat in a small enough area to get results, I'd be shocked if a little butane mini torch could), but with the shrinking disk I was in a spot that I really coudn't back up my work with a dolly but found that it once you got the metal moving it worked without the hammer/dolly, that I could just hit it wherever it got too tight.
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