• ultimately don't worry about knackering the thread - if you need to get it off to use the frame you'll and there's no other way - you'll have to do it- and you can use a forked wedge to take it off (not ideal for any BB - but i 've never seen harm done)if thread knackered - you can still use it and take it on/ off bikes .

    if plug is plastic and nothing else has worked then heat will melt / burn it out

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