drop-out screws?
 

Drop-out adjuster screws have a slotted end and a knurled end.
How do they go in? Knurled or slotted side out? And what side does the spring go on?

I've always seen spring outside the dropout slot inside.
and what does the spring do if the adjuster is threaded in?
Otherguy? T-Mar? Bheuler. . .

Thanks Lotek, I was wondering abot the redundacy of that spring too.

The spring is to keep the adjuster from moving, like the spring on a derailer adjustment screw.

The adjuster is installed from the inside of the drop-out, with the spring also inside. You use a small screwdriver to screw it in, then hold it in place so you can put the knurled knob on. The knurled end (knob) then screws onto the threaded end protruding on the outside of the drop-out. While holding the screw slot with your screwdriver, put that knob on tightly (otherwise it'll fall off).
Yup; the springs just to keep it from turning by itself.