The plastic bits that are supposed to support the clips on either side of the housing are broken (my dogs like to tussle). I've wired the two ends of the collar to each other to keep it from falling off, but the housing still comes loose (only one side is broken, so it sort of hinges open from the intact side.) I'd like to drill through the housing and wire the collar directly, in place of the clip, Anyone have a diagram of the internals so I can be sure I'm not drilling into anything important?