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Told you you had it. And the home made flap wheel is what I used on mine with 600 wet or dry paper and WD 40. Taped the inside edge of the paper to a wood dowel and wrapped the paper around the dowel a dozen times or so by using the drill on slow. Then wiped the WD-40 inside and spun the drill for a few seconds and checked it. After a couple tries I was done. Sprayed it out with carb cleaned and lubed it up with 3 n one oil and put it all back together. Those balls should pop loose with a light tap from a screwdriver handle. Should just be stuck with the same gunk and as the piston was. I would test the pump for running before bolting it all in, just plug it in and turn on the switch and then hold the pump bracket against the frame for the ground connection and it should happily rattle away. Put you finger over the inlet and you should feel a little suction.
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