The fat centering ring is art of the upper bulkhead. It will glue to one of the flat disks.
A ring this thick should be sanded flat, the surface is a little uneven.
The white bulkhead disk is wider than than the green ring.
Sand the edges for a slip fit into the BT-55 sized tube.
In preparation for the next step,
There are ridges on the interior of the large centering rings.
Before peeling away some inside layers, try pressing them down with a hard, round object like a pen barrel or dowel.
If they are still too tight, lightly sand or peel if necessary.
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