Okay...an update...and a new question. I ended up just buying all new spokes and nipples. I was having trouble truing the wheel and the spokes were sticking up through the nipple a lot, so I took the wheels into the shop. The shop guy said I bought the wrong spokes. (too long)
I had carefully measured a spoke to be 298mm. He said I needed 296mm on everything but the non-crank side of the rear wheel. Okay, to be sure, I went to 295mm and bought 54 more spokes. All is well, now, spoke-wise.
So I also bought some Slime tire liners. I had no idea something like those could be such a headache to install. Has anybody got any suggestions to help get those in place, and keep them there? I was wondering about rubber cement...?
Also, what is safe to use to make it easier to install a tire. On both front and rear wheels the valve stem is crooked, but the tire & tube will not budge the half inch on the rim it would take to straighten the stem. I tried soapy water but no help.