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I just got off the phone with Michael Engineering, maker of the Sticky Stuff
pump.

Both Chuck and Mike there tell me, if a Teta pump is modified to pump Jeffco
stuff, air can get in and cavitate the the hardener side of the pump.  The
reason is....the check valve on the inlet side requires a lighter spring for
the Jeffco hardener.  All these mod parts are avaiable through them, of
course.

Someone, on this forum, was noticing air coming out of the hardener side of
his pump when he bled the check valve with a plastic stick. This may
indicate the spring is too stiff not allowing the Jeffco hardener to get
sucked in on the fill side of the handle stroke.  

There is more to modifying the Teta pump than just redrilling the handle to
accommodate the new ratio.  Be watchful.

Michael Engineering's phone is 517-772-4073

Find the fun......Jerry Grimmonpre' L320