I have a set of Shimano 600 tri-color cranks that seem to be welded to the square taper BB. My park tool crank remover has not made any headway at all, and I'm reluctant to use any more torque on it for fear of stripping the removal threads. I have an automotive-type pulley/gear puller but the "hooks" are too large to fit between the back of the crank and the BB. I could grind them down, but is there a puller that others have used to remove stuck cranks? I'm willing to buy a tool if it will do that job properly without damage to the cranks.

Looking for recommendations. Thanks in advance.

Apparently I can't spell "square" this morning. Don't know how to edit the thread title.