jamesdak 

Threading on these seem standard. I tried 3 different sets of DT shifters and no issue screwing them on.

That said. I just spent a couple of hours just going over the parts that came on it. Basically cleaned everything really well, got rid of some corrosion on some parts, polished up all the metal parts to include pretty much every piece of the shifters, lubed what I thought needed to be, and reinstalled them. I also went over both derailleur thoroughly. Lots of deep cleaning, and then relubing. Finally new shift cables and better ferrules on the RD cable housing. New KMC chain and dialed things in.

Felt a lot better on the stand and took it out for a short test ride. Yep, A LOT better even with the original parts. Shift action is now very light and smooth. Throws are still annoying long for the FD but I can live with that. I realized while working on it that I had a 9 speed cassette on that wheel not an 8 like I thought. So I used a 9 speed chain and the drivetrain in a lot quieter now and less trimming on the rear because of noise like the first ride. Time to just enjoy this ride.