No I'm going to go on with the shutter tester fabrication. It's been done enough times out there to where mine should work out also. The mouse has 4 photodiodes in it, and the one I used I de-soldered from the circuit board. Could be fried. Will continue on with the 9V and potentiometer design before calling it a fried photodiode. When I'm at that point I'll cut another off the circuit board and use my super-fine wire and wrap it around the legs, and keep the soldering iron out of the picture. Not time to give up just yet. This is going to work.