The engine block was notched for a better fit over the top bend of the engine hook.
Even with the better fit over the ST-7 tube, the centering rings were hard to get straight.TIP: Use the back end of your straightedge for a true 90 degree angle. Turn the tube and check the ring against the straightedge.
The instructions say to glue the upper ring flush with the end of the engine mount tube.
I'd rather glue it about 1/16" back so I can use glue fillets on both sides of the ring. Gluing the ring in this new position doesn't effect the fit of any upcoming parts or assembly.
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