sanding smooth sounds like a lot of work to me.
Just how cold & snowy is it out there?
Do you have spare sliders to experiment with?
I'd guess a pair could be had cheap.
If you go with removing the textured finish of the casting, would you also remove that "casting flash" sort of vertical rib that runs up the back of the slider?
Seems to me you could go all or nothing... pretty much whatever you like.
"If you want to fix it with a rock, you have to stick to stone-age technology" -Anton
"...solving the latest crisis that is preventing my Airhead from taking me to the bar." -Beater-