You must be logged in and verified to contact the designer.
This is a great shortcut for those tedious tasks and the workload can be minimized.
IMPROVED UPDATE: You will now be able to make no special accomodations and use the BT-50 tube as per the original vintage instructions and butt it against the inner forward centering ring, Easy! You'll have three points of contact to the motor tube when its all done. Happy Flying!