You are welcome.
Hi again,
Any spar alloy will be fine. Avoid "aircraft" aluminum. Bushings' walls should be at least 1/8" thick. And never, I repeat never use 5200 for this kind of job, nor most other jobs. A little UHMW tape or similar will serve to isolate the doubler from the mast. Fasten with a multitude of flathead machine screws, all bedded with Tef-Gel. Be sure the bushing picks up mast well as well as doubler. Ideally drilling for the bushing will get you to sound metal.
Fair leads,
Brion Toss
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