Steel square taper bmx or mtb cranks

hi I have some sugino steel one ones. same as these..
http://bmxmuseum.com/forsale/172681

problem is them is they are quite rough, the threads to remove them have dents round them.
square tapers are fine and I was using them at one point. if I remember right I had to use a small car ball joint splitter to get them off.
 
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