Aerotech Mega Initiator #89541, Part 8, Ring Diameter Sizing

Both the inside and the outside edges of most rings need to be sized to slide into or over the tubes.

I used a combination of a sharp knife and a half round diamond file to slightly increase or decrease the diameters. I found that removing the laser ash brought them to almost the correct size.

The additional motor mounts need some sizing.

That smaller (inside) ring should slide into and almost "lock" into the largest mount tube.

That required a slight angle sand.

Sand a little, test the fit and continue until it friction fits into the larger motor mount tube.

This is the adapter bulkhead.

The instructions don't mention it, but put a washer on both sides of the ring. The screw eye and threaded bolt are locked in place with some epoxy.