Here's the kit supplied engine hook.
The instructions say to put the short bend towards the back. It didn't look like there is enough of the hook to hold the engine in at ejection.
The split ring is glued on the engine mount tube, even with the back end. The mount is slid in from the rear and stops against a shoulder inside the fin unit.
The mount is "locked" inside the fin unit when the front ring is glued on. I notched the ring to fit over the engine hook.
The finished fin can is a well designed unit.
The two centering rings hold the mount securely. With the rings on either side of the fins you really don't need to glue the mount to the plastic fin can.
I'll put a drop of CA on it to prevent it from turning.
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