If you have good, sharp scissors you can cut the outside of the rings with them.
Here I cut right down the pencil line. I want a bit of a border so the rings can be sanded to fit the BT-58 tube.
As usual, I made two extras and will pick the best of the four.
All the rings were slipped over a BT-5. The outside edges were gang sanded. The central tube gives support and alignment while sanding.
The rings were punched for the engine hook.
On the other side is a small hole for a replaceable Kevlar line.
I used a rotary punch to make the notches. Here I'm cutting off the bottom of the round punch for a squared corner.
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