The instructions tell you to use the Estes Mini-Engine Mount Kit # 303157.
I think the engine mount kit is out of production, so I made mine from engine casings and some leftover BT-5 tubing.
The 1" long AR-520 was cut from an engine spacing casing. I did have to remove some of the interior winds to get a good fit over the BT-5.
This is the 1" long AR-520 adapter after fitting.
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