If that is the case, I'm OK, because both of the flywheels I've got for the Torque-Major have the three lugs (raised bars) that slot into the impulse cup. But the lugs wouldn't stop you using the relax-rewind cup too, so why they'd need to make two different flywheels is a puzzle. Looking at the pictures of other people's restoration projects I do know that there was a curved fan blade flywheel and a straight fan blade flywheel used on the Torque-Major. I assume this is a design modification, with the straight blade being the later type; both my T-Ms are Seventies engines and have the straight blades.
