I only had a Estes style BT-50 sized engine block. It was too loose a fit in the Centuri ST-9, 24mm engine mount.
The outside diameter was built up using a copy paper wrap strip.
Glue was applied with a glue stick.
The strip was wrapped around the block and allowed to dry.
The overhang edges were sanded off with a block.
Here's the locking wood strip.
It is glued into the rear of the body tube, recessed by 1/4" inside the tube.
A very slight glue fillet was set into the sides, the excess wiped away with a Q-tip. Don't end up with much glue on the sides, it might get in the way of the sliding centering rings.
This shows the 24mm mount being slid into the main tube.
The upper centering ring slot slides over the locking strip. The mount is slid in until it stops against the lower ring.
Turn the engine mount and it is locked over the wood strip.
That's realer a simple and ingenious idea. The interchangeable motor mount I did on my Semroc Saturn 1B, based on one I found online, is way more complicated. Of course, the rocket is more complicated, so it needs to be. Once I manage to finish it, it will be great to see how it works.
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