ASP Engine Adapter 13/18 Part 2

Press the peeled rings into place using a flat surface. I'm using the flat side of my sanding block.
Using a flat surface like this guarantees the ends are flush.

TIP: You should take down the raised "burrs" along the inside of the centering rings.
This makes fitting the BT-5 tube much easier,

Any round surface can be rolled over the raised edges. I'll use a dowel or back end of my X-Acto knife handle.

With the engine hook set into the slit, the dried coupler assembly is slid over the BT-5 tube 
The rear 5/20 ring slides over the engine hook.
The fit was tight, you can see the BT-5 tube being pressed in a bit.

Mark the lower centering ring for a shallow notch.

TIP: Cut your notch on the opposite side of the interior wrap seam.

Centering rings are rarely glued very well. If you were to cut the notch on the seam (or side of the wrap seam) the wrap nearest the seam could come off.