Why in the H#!! would anyone have taken the time to make pie-cuts in an otherwise adequate circular opening...and for what result....FOOLISH!

Yeah, I'm not opposed to firing up the MIG. I'll take a step back, but I do like your reasoning.

OK sir, lastly I need some more wisdom on housing mounting. From the description...it sure appears you would bolt this up using the thru holes in the back. The pie-cuts serve no function other than lining up and centering the housing. Do you agree with that? So, to reiterate how do one manipulate small hardware in that particular local?

George