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@gordongannet
Ok I won't panic. I've used this method on Condor 853 ProTeam frame - very thin tube, and a Cougar SLX frame - again very thin, without a mark on the steel. As I say, its just a light touch you use and you go slowly through the aluminium seat tube but it simply doesn't have enough force to touch the steel. I've been pretty cautious each time I've done it but pleasantly surprised by the results.