A 1/8" wide slit is cut in the BT-5 for the engine hook, 3/16" from one end.
The engine block is glued in place and rests against the upper bend of the hook.
The shorter 5/20 ring is notched to slide over the engine hook.
The shorter notched ring is slid over the engine mount tube until it is 3/4" from the open end. (on the right of the picture)
The longer 5/20 ring is notched to slide over the engine hook from the front. I drew pencil line around the notch I made to better show how it was cut.
The longer 5/20 ring is glued in place so there is 5/32" between the two rings.
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