Like I said guys, if you have a simple install with a very solid mounting surface and plenty of room to fit the backing plate just order or use something pre-made..
If the install is tough and you have a machine shop at your disposal use stainless, carbon fiber, or whatever those pre-made plates you are speaking of are made out of..
Otherwise if you have a funky install like many of us do, and do not actually own a machine shop, find a local metal shop and buy some 3/16 - 1/4 inch aluminum plate cut approximately to your needs. You can then bore a hole, trim to exact fit, and shape as desired with wood tools.
Jon
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