Mercury Water Pumps again

[RalphG]

Just an update. I decided to keep both rebuilt pumps, even the left side one with the wrong pulley since I read here that it can work just buy a different length belt to run both pumps off one belt.
Got the left side pump off this evening and my worst fears did not happen. The internal bolt in the lower water outlet was pretty stubborn but came out without rounding off the head or twisting off. I had to use a 14 mm socket as the nine sixteenths seemed a loose fit and I was afraid it would round off. Lots of penetrating oil and patience.