Snapping the fins in place distorts the round tube slightly. While the centering ring is a perfect circle, you might find it difficult to slide the ring in the rear.
There's no way to test the fit, remove it and adjust, so you'll have to do it ahead of sliding it in.
I marked one side so I could easily tell which side goes in.
The inside hole was filed to a slight angle to slide over the motor mount tube.
This makes it easier to to slide past the inside lip of the tube.
The ring is slid in until it rests against the thru-the-wall fin root edges. Now wood glue fillets can be applied
Notice the outside wrap of motor mount tube has peeled back. This happened when the inside of the centering ring was rubbing against the tube edge. No problem - the aluminum motor retainer will cover it.
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