Hopefully this will help: Jalousie Windows Rv
These operators have a splined shaft that both the knob and crank will fit. I had knobs where a crank handle would stick out too much.
My OEM operators/gearbox) were also riveted, as were all the joints. I drilled them out and used small stove bolts and self-locking (nylock) nuts during re-assembly.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"