The picture on the left shows a dry fit of the two tubes joined by the coupler.
Note the pencil reference line, drawn where the tube fit is best. There are still small gaps.
On the right is a better fit, sanding the tube ends square with a sanding block.
The coupler ends are beveled for an easier slip fit in the tubes.
The bevel also lets the glue pool up at the edge a bit.
If you use yellow or white glue, don't use too much. The dried glue could shrink the tube.
I'd recommend using epoxy for couplers and engine mounts. Epoxy won't lock up like yellow or white glue can.
After sliding the two tubes together, I use a burnisher to mold any raised areas.
CWF is brushed on the seam joint and sanded.
On the right you can see the high and low spots after sanding.
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