I just noticed this thread, Billy I am so glad you are on the rebound and hope your recovery continues in a forward direction. Paul when you wrote that Billy was sitting on your 450 testing out his shifting reminded me of when I was 11 with a cast on my right lower leg, I was riding my bicycle when my foot slipped off the pedal on the down stroke, the pedal came around and caught me behind the knee
while my bare toes and the bottom of my cast ground into the asphalt. Ahh the sweetness of rat trap pedals and a coaster brake.