The engine hook slot was a small punch made with an X-Acto knife tip.
Rather than just punching the engine hook through the tube, I enlarged the slot and cleaned it up.
This is typical of some Centuri engine mounts from the late 1970s. The lower ST-7 tube is 3" long.
No engine block, a coupler butts up against the upper bend of the engine hook. The coupler also connects the longer top tube.
A Kevlar line is tied through a small hole in the coupler.
Instead of masking tape I used a wrap of electrical tape to hold down the center of the engine hook.
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