I have a rare 16mm Cine -Kodak K-100 motor drive shaft for sale. It also comes with a copy of the original manual. It has a pin on the end of the shaft to fit Tobins TXM-20BA crystal sink motor. The pin can be driven out to fit different motor couplings if need be. This allows the K-100 to become a versatile and reliable crystal sink camera at a very affordible price. I am selling it for $225.00