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@number6
i had trouble with an old TA crank - larger size on the thread for pulling crank off. some bike shops carry the older larger size tools (sam at sett valley had one- but even then the threads were knackered)- but i went to wills wheels - in stockport - he had an old tool that was a pair of forked wedges - driven in behind the crank with a hammer and they popped off - no damage to BB or crank. don't try to mock something up though (with a single wedge of some kind) the pressure needs to be even - the two wedges go in one either side. i've tried a single wedge and hammer in the past - it didn't pan out well
i think this was a really old tool from the cotter pin days - if you're near stockport - he's on the A6 in heaton moor - if not maybe some old school shop near you may have one.
i have an old school flywheel puller - (for a cars flywheel - no idea where it can from it's always been in my dads garage - but that could work too - it''ll be a bodge though - that was my paln B - plan C was the angle grinder)