IF I UNDERSTAND YOUR QUESTION,THERE IS A 12 MM. SEAL BOLT BEHIND THE REAR BALANCER GEAR THAT YOU REMOVE AND THERE’S A HOLE IN THE SHAFT THAT LOCKS THE SHAFT IN POSITION FOR INSTALLING THE BELT. ON OLD PAPER I HAVE ,IT IS WRITEN “BALANCE SHAFT LOCK PIN 07LAG-PT20100. HOPE IT HELPS. P.S. I USED A OLD HARDED BOLT THE SAME HAS THE DIAMETER OF THE HOLE IN THE SHAFT
my first car was a 68 bug, it looked like it had a lawn mower engine,it was so easy to work on. but tell us were your at with the project,
have you got a frame or engine, so on…