When your Reveal will not squeeze you have o-ring swell on the piston which squirts the fluid out. I think the piston rubber swells under the influence of the solvents that people use to clean their floor. My fix, take it apart, and drill out (ream) the plastic cylinder the piston moves up and down in so it moves freely.
Now it works fine. I also stretched the spring a little.
The designers forgot about o-ring swell. Remember the Challenger?
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