On the left, one side of the coupler cut size is sanded on a block with 220 grit.
On the right, clear tape holds the ends together with a good, slip fit.
Here's the finished engine mount.
The clear coupler is held in place between the upper two centering rings. There is no glue holding the clear coupler to the rings.
The kit didn't include and engine block, I added one.
Before cutting the fin slots, the tube seams were filled.
These older tubes had very tight, almost invisible seams. It only took one good shot of filler/primer and sanding to fill them.
On the left, a paper towel is wrapped around a painting wand for a better fit inside the BT-60. On the right, an inside wrap of tape keeps out the filler/primer spray.
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