Custom SLV Build #10044, Part 3, Engine Mount Placement

Here's how the instructions say to lay in glue beads in the 3" BT-60 tube. When assembled, the top and bottom rings are to be flush with the ends of the body tube. The instructions imply a lot of glue, on all parts.
I cut the replacement BT-60 tube at 3 1/16" so I could have an overhang and a fillet ring at the bottom.

The top rings will be flush with the tube edge.
A ring of glue was applied around the inside top after the bottom rings were slid in - otherwise most of the glue would be slid around throughout the inside of the tube.

On the left is the top ring, flush with the edge of the BT-60 tube.

On the right is the back end. You can see the slight body tube lip extending beyond the ring face. This allows me to apply a glue fillet in that lip edge.