[quote=Dogboy]Maybe variations in the castings or plungers. On mine, the plunger has to be removed from the top by removing the cam. If you can get it out through the bottom, then you're right, no need to remove the cam.
Another thought is perhaps someone installed a H16 plunger in your casting. The 16 plunger is a cylindrical profile with a hemispherical tip. The 18 plunger is a square profile with a full radius (half round) tip. The 16 plunger could probably be installed from the bottom.
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