Just finished W/P replacement on my '88 Spider. Accessibility problems due to A/C prevented easy access to the 7 O'clock stud or use of an impact wrench to remove the crank pulley. Pried the water pump as far forward as I could on the stud and cut it as long as I could with a hacksaw blade. Pump then was removable. Enough threads on the stud now allowed easy access and visibility for double nut extraction once the pump was out of the way. It did respond after a couple of sound whacks with a brass hammer.
Am I to understand from the previous threads that anyone would want to attempt to exchange a spider water pump without removing the radiator??? Why? I suppose it "Could" be done, but only as an exercise in self abuse.