Quoted from EvanDickson:There's only minor corrosion, I've definitely seen much worse.
I'm more concerned with the corrosion you cant see. 
(Topic ID: 235032)
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Quoted from EvanDickson:I don't have the equipment to bench test the MPU unfortunately.
You may want to look into obtaining a switch matrix tester https://www.pinitech.com/products/64switch_tester.php with this board, a logic probe, and a power supply you can quickly diagnose the entire switch matrix on your bench.
IMG_1744 (resized).JPGQuoted from DumbAss:It looks like he is selling populated Two Bits boards. I think he said he provides nylon screws but you should be aware that there is a risk of breaking the solder mask of the +5V trace with a SEMS screw at the bottom of the board and shorting +5V to GND.
I wouldn't use nylon screws, all you need is a nylon washer on the top side of the board this is where the 5V BUSS is located. Notice how close the power traces are to the edges of the board?
IMG_2030 (resized).JPGQuoted from EvanDickson:Do you mean the left middle screw, at the bottom left in that picture? I could always just not use that screw at all when I mount the board.
Its mainly the bottom 2 screws that fasten to the notched out sections on the bottom of the board.
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