My GF and I took two 99 Handcranks to our state historical museum for Ks day. 1500 kids came through and many of them tried our machines. Great fun. At slow times we let parents and teachers try them too. We had one Singer crankt and one repo. The repo crank fit on 66s and 99s. Haven't taken the Singer one off the 99. Hoping to pick up another 99 today, but not nearly as nice as the original poster's.