As shown by the arrow, I've attached the lead to the plates to this area formerly used to hold the plates in place. I've removed the rubber grommets I previously used to seal this water tight and drilled this hole out larger. I then inserted the 1/4 - 20 stainless bolt with nut and washer up to the hole centered. I then filled the hole with epoxy, in this case JB Weld, and this sealed it up very water tight giving a solid place to attach the power leads on both sides.

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