Thanks Bob....

Another important thing about rubber prep. After washing the anti-blocking agent off the rubber, I've found that the rubber will adhere best if fresh rubber was exposed.

This is what I do: with a dremmel fitted with a drum sander, I freshen up the rubber where it adheres to the ply rings. Basically I remove the gloss from the rubber. Once fitted, the rubber sticks extremely strongly to the ply using thin ca. No need to lead by first putting on thick ca then flipping the rubber onto the plywood. I simply assemble, then wick the thin ca in place. The rubber will tear before the bond gives up. It's the best you can do

Don't bother with the rubber filled ca. Thin ca works best