Would using JB-weld and a plate of metal get you close to where you want to be? Use the quick set JB to glue on a mount for your thing. You can use masking tape to build a dam to put the JB in to build up the area then grind it to shape with a dremel or file/sandpaper etc. Just some ideas for you .

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norms-iron-works.tripod.com
motor assisted bicycle engine headlights that work off of your white power wire. check it out