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Alecw35 wrote : To remove cotter pins is difficult. I have a Vice.  So I get a large nut.  Car wheel nut maybe.  Loosen off the cotter nut a bit.  Put the frame up on the vice with the cotter in the jaws.  So that the nut is on one jaw ant the plain end is in the other jaw, straight across.  The Wheel nut is a loose fit on the plain end of the cotter.  With that on the plain end.  Keeping the crank straight in the vice.  Maybe having an assistant from the studio audience, to hold it.  Tighten the handle.  It must stay straight as you'll bend it.  If ok it will go bang, then loose in the vice.  Then just push it out.  This way the pin and the cranks will not be damaged and they will be reusable.