DIY sanding drum using bottle cap

Nilo

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While building a 3" fiberglass rocket, I built this sanding drum to use with a drill, and I was able to sand inside the body tube, forward of the fin slots, to ensure a good bond of the forward centering ring on the motor mount tube to the body tube.

I used a 5/16" rod.
Drilled a hole on a cap.
CA a washer on the inside, and outside of the cap.
Cut sanding paper to go around the cap, and CA it.
 

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