The engine mount was glued into the ST-18 (1.840" diameter) body tube.
The rear ring is recessed 3/4" up from the rear.
TIP: On a mount this wide, I don't lay a glue ring in the main tube and slide the mount into the glue. The mount is slid in place, up to the 3/4" line, then add fillets on the bottom and the top.
With centering rings this big, you've got plenty of room to lay a fillet and smooth it out with a finger.
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