Before gluing the coupler into the tube, look close at the picture.
With the black coupler slid in, 1/2 of the the centering ring (thickness) is sticking out of the tube end.
This makes a gluing "step" and a little more gluing surface for the angled shroud.
Before gluing the shroud, run the edges lightly over a piece of sandpaper on a block to remove any raised areas. You want the edge of this shroud flat to match as close as possible to the end of the BT-60 tube.
It makes no difference how careful you are with scissors or a knife, there will be some inconsistencies in the cuts.
The mount was used as a gauge to estimate where a glue line would go in the tube. You can see the pencil line drawn inside the BT-60. A bead of glue was layed inside and the assembly slid in place up to 1/2 of the centering ring thickness. It should look like the first picture.
Before the glue set up, the mount was turned to smooth out the glue bead at the top of the upper centering ring joint. Like before, this made a smooth internal fillet.
TIP: With some new white tubes (made with recycled fibers) a heavy internal white glue bead can shrink up the tube. After drying, a slight recessed ring can be seen from the outside. Be aware of how much glue you use on an internal fillet.
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