Yup, I cleaned out the plunger and everything inside of it as well, which is why I found the results to be so weird. Jig-A-Loo says that it reacts with certain types of plastics, I guess the stuff used in the plunger was one of them. I used the same thing on the trigger mechanism on my longshot so it wouldn't rub up against the little peg that restricts it's movement and it worked fine.
I've recently tried using that Jig-A-Loo stuff as a lubricant for the plunger. I wouldn't recommend it, as it seems to be reacting with either the O-Rings or the Plunger mechanism itself. It is almost eating away at the plastic and leaving little chips of it in the plunger chamber. Even though the Jig-A-Loo isn't petroleum based, I'm not sure it works.
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