This may not be what you want to hear, but I just made an 8x10 to 4x5 reducing back using a 12x12" piece of nice plywood and a spare Horseman standard. Used only hand tools. It fits my Studio Ansco so I can shoot Fujiroid at an Art opening. I even painted it grey like the camera. Works just fine. Grover/Watson reducing backs keep popping up on eBay.
I would not recommend cutting an 8x10 back down, it will be the same, if not more work than making one.
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