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Im first wondering why u took a good grinder apart ??? could it be that it was working only intermittently ?? if that is so , im betting the little spring is either the spring that pushes the start switch back up when u let go (otherwise it would run forever) or it might be a motor brush holder tension spring , that's most likely why its working only intermittently the brushes are worn down and need replaced , a neet hack 4 this is to use electric drill brushes ! I found they fit and can be sourced from a well stocked hardware store !!
Have your son "play" with it again, or at least have him show you what he was doing when it "fell" out, he may have stumbled on the technique, but chances are a tab has broken off meaning it should be easier to remove now. Good Luck!
Go on line to porter cable customer service ask for a blow out of the motor of your 7336 assembly 6 inch variable speed sander they will have the parts blow up showing each part with a line going into each area where the parts fit together Good luck
Most wipers are replaced with the entire blade and holder assembly, and many no longer facilitate blade itself replacement. It is worth it, as the arm and spring wear, over time.
The entire blade and holder easily separate from the arm and the new one clicks right in.
I have a 2002. I thought this problem got fixed before 2005. I couldn't get my arm off because of internal corrosion. I took the wiper blade off to get a little more swing with the arm. I oiled and swung the arm to get it loosened up. Then I bent the arm towards the glass to get more spring pressure and reattached the blade. That will work for a little while. You can get a new arm from Autozone #42536 for $28 plus shipping.
mazzers have 3 springs in grinder body, each one support for upper burr holder. check for them , if it is not the case than consider that the spring could come with coffee. often we see stones and metal parts geting between burrs. clean it again and look good for 3 springs , if they are in their place, close the burrs to finest than go back for half of circle and grind coffee.