Hey Marc,
I am restoring a BC1300 too...if you find the proper jack shaft, please let me know...I'd love to have one that is just like the original. Mine was too chewed up to use, and the one for the front peg bike from OldMiniBikes is too short. I need one like your original with the gear on the outside of the bearing support
cringed a bit when I see you cut yours...but I do understand!