From the original instructions:
There is a side Kraft centering tube set over the engine tube and engine hook.
I don't have a 3/4" long centering tube, so we'll "make" one.
For tighter glue joints, sand the ends flat.
Slide the rings over a BT-20 tube and glue just the rings together, don't glue them to the tube yet.
Sliding the rings over the tube is for a true, straight alignment.
The first picture shows how little glue was used.
After the glue dries, slide the three glued rings off the tube.
The diameter of the centering rings will be too small for a good fit in the BT-52 tube.
Using a glue stick, I wrapped some cardstock around the rings to build up the outside diameter. The ends were then sanded flat.
Don't glue the engine mount in place yet -
Being that a BT-50 would basically have a slip-fit inside a BT-51 or BT-52, you could've done a variation of centering rings glued to the ends of tube coupler. A short length of BT-50 with AR-2050 centering rings glued into the ends.
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