Centuri Skylab Build, #KB-4, Part 13, Lower Tube Centering Rings

The instructions say to "snap" the rings into the tubes by pressing the tube onto the rings on a tabletop.

I rolled a dowel over over the joint to be sure the ring face was flush with the end of the tube.

Internal fillets were applied using a Q-tip taped onto a dowel.

Use small drops of glue on the Q-tip. The Q-tip is then used to smooth the glue and pick up the excess.

A light sanding follows to remove any dried glue and even up any roughness.