Hi all, I'm new to this forum so hope I'm not breaking the rules by immediately asking a question. I'm trying to renovate the title Susie after it sat in a barn for 25 years and all is going well until finding a front drive sprocket. Everywhere I look online comes up with a 12 tooth sprocket, which is correct, but the internal 'hole' is too small to fit on the output shaft. The ones I have received, and seen, all have a hole that is ~3/4" dia. Mine is a solid 1". The bike was built in December 1972 according to the label on the steering stem. Does anyone know if the first year of production used a larger diameter output shaft? Could mine have an output shaft from a different model?