Sounds like the pump shaft is not seated. On mine, it will get very hard to pump, but I can still get the shaft to fully retract into the pump, then I can turn it clockwise to lock it in place.
I'd try turning it counter clockwise several times and them push hard to seat the shaft into the pump housing. When seated, turn clockwise to lock in place.
Fred
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Fred & Vicki
St. Augustine, Fl.
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