A little off topic, but may be some useful info.
I also bought my S2 Singlecut used, and the stoptail studs were a little beat up (looks like a screwdriver with too narrow of a tip was used to adjust them, probably with tensioned strings), so I wanted to replace the studs. It turns out the S2's stoptail studs are not the same thread pattern as on the Core model, so they aren't a direct swap (found out the hard way). I contacted PRS about where I could purchase replacement S2 studs, and they just sent me a set for free. Awesome!
As far as the stoptail on the S2, my understanding is it's the same as what's used on the Core model. So singlecut buyers get a bonus there, whereas S2 trem buyers get an SE trem. Just wanted to offer that in case you were thinking of changing it to get a higher quality part.
I've got 10's on mine, and lowered the action, and was still able to get dead on intonation with the stock stoptail. If you're set on replacing it though, seems like the Mann is a terrific option.
Also looks like the 2016 models have adjustable intonation, so perhaps that stoptail will be available from PRS to purchase at some point.
