'Sugino extractor/tightening tool to do the job'
On the crank arms where the side bolts are, You will see that there is a thread. One part of a crank arm extractor screws onto this thread. The other part of the extractor requires you to turn clockwise using a wrench. As you turn clockwise you will find that the crank arm eases from the spindle. Quite simple and a hell of alot better than the old hammer thats for sure.