Well, the pictures I thought I took seem to have vanished into the black hole that is my SD card. So I took a new one that should do...
Starting on the right side...
There is a black toggle switch that I have installed - it has a rubber boot. It switches the shocker device, so I can turn the shocker off for handling during maintenance, and mounting/dismounting the feed spreader from the barrel. It does NOT switch the motor for the spreader itself.
An inch or two to the left of that is the hole where the solar panel wire feeds in, to charge the on-board 6-volt battery. Also, coming out of that hole is a nylon coated stainless steel "leader", like fishermen use for fishing toothed fish, like walleye and the like. It will feed back through the rubber grommet that the charge wires come in through, and provide a nearly water tight seal. The leader attaches to a cage that is chromed steel, which completely encloses the spreader.
Just below that, you can see a blue wire nut, and a pair of blue wires that feed out from the black, rectangular shocker. One attaches to the stainless steel leader, and the other attaches to a galvanized wire that you can see "threaded" around the fins on the top half of the spreader. The shocker doesn't look like much, but I can assure you, the experience is not pleasant.
At the top of the shocker body are a black and red wire that feed into the inside. The black is directly attached to the clip that attaches to the ground on the battery, via wire nut. The red connects to the positive terminal clip, via the switch that I pointed out in the first paragraph.
The switch had to be added through a hole I drilled, and which I afterwards sealed with silicone caulk. I used the same silicone caulk around the very tiny hole where the galvanized wire exits the body of the spreader. I drilled a bunch of tiny holes, and then threaded the galvanized wire twice around - once above, and once below the opening where the raccoons might reach through to gain access to corn on the spinner plate.
Finally, the spinner plate was removed, and replaced with a metal one. as was the outlet funnel.
I think my raccoon problems are solved, but I am not counting on it - little buggers are crafty.
Previous to the raccoon issues, I had already done some minor modifications, to allow the solar to hook up in a water tight manner, yet be easily removed, should the need arise. Good thing I did, or this would have been a bigger pain in the rear than it had to be, the solar panel itself it currently 25 miles away, bolted to the legs of the barrel.
Thanks again, to everyone who helped. Even though I ended up using a pre-built module, there was a learning experience here that I appreciated the opportunity to have.