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Step 7Build bracket to mount circuit and battery holder.
As most people know, a 9V battery fits quite well inside a 35mm photographic film canister. I decided to use that as the weather-resistant battery holder. I fit things roughly in place around the back of the reflector and built a metal bracket by drilling some holes in a piece of thin steel. One was in the center and large enough to allow the reflector mounting screw to pass through (1/4"). I drilled two more 3/16" holes on either side, spaced fairly evenly. I just wanted a few points I could mount things.
I drilled a 3/16" hole in the side of the film canister toward the bottom. I used a #10-32 screw, nut, and washer to mount it. I cut a small hole with a hobby knife to feed the wires from the battery snap and set it in place.
I drilled a 3/16" hole in the side of the film canister toward the bottom. I used a #10-32 screw, nut, and washer to mount it. I cut a small hole with a hobby knife to feed the wires from the battery snap and set it in place.
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