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Dave, I do the same thing. For a pilot drill. I use the top end off of single use motors. You can also leave the bottom bulkhead in place even when you go to glue the new motor tube in place. I drill/file "half holes next to the fin tabs. Then apply "thickened" epoxy to the motor tube at 1/3 circumference marks. Line up the epoxy with the "half holes" and insert motor tube. Once in place give it a slight spin to engage the epoxy to fin tabs.
Tony
Tony