I like to strengthen the inside lip of BT-20 and 50 tubes with a wipe of medium CA glue.
Think ahead, You don't want any CA glue where wood glue would follow. The CA glue seals the tube, no wood glue can soak in.
After the CA dries,
square up the tube end with some 400 grit on a block.
Right out of the bag,
The corners of the nose cone shoulder are square.
Round the ends off for an easier insertion in the body tube.
Here's the rounded shoulder.
The rounded edge won't fray or start a peel of the inside layers of the BT-50 tube.
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