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@freddo
take it slowly getting those cranks off - if you've never used a crank extractor before, it's kindof easy to strip the threads, and Sugino 75's are far too nice to be practicing on...
best thing to do is ensure the threads are clean and get the inner screw / bolt almost all the way out, before you screw the main body on to the crank threads. Get the main body all the way on, as far as it'll go (without using too much torque). Use a good (well fitting spanner), or you may scratch your cranks at this point. Screw the inner bolt back in, ideally using a socket or ring spanner, so that it doesn't slip. You'll meet firm resistance before they give. As soon as you feel this give, stop turning, your cranks should be free from the BB. the crank extractor should come back off by hand.
also, use a good quality tool, some don't have deep / long enough threads. I use BBB, but there are many good ones out there.