Charles Davis wrote, "I just feel that the wheel-type of crank
will help it to crank more smoothly (easily)."

I agree that a flywheel will smooth out the cranking.  I notice that
when others play my organs, that their cranking is often uneven.

There is a person in Ontario, Canada, who can supply a flywheel for your
organ.  He had one made for his Raffin 20, then decided to offer them
to other people.  He has several sizes at a reasonable price.  He says
his larger designs will fit Hofbauer organs.  His website is
http://flywheelsforsale.yolasite.com/ 

Roger Jones