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I want to use a rear hub motor in place of the mid axle. Will the disc brake spot be strong enough to mount a gear that will drive the back axle?

I'm gonna build my own battery, 18650's. There is a test tube holder that holds 10 X 4 18mm test tubes. Thinking of buying 8 of these and epoxying them together to double the thickness. They're cheap. $5-6 ea. Has any one tried this? Here is a link to what I'm thinking of using...