How do you adjust the height on a floating bridge (AF,PM) when the jagged wheels just won't turn because of the string pressure. I tried to turn 'em counter-clock wise with my fingers but it just won't turn, so I took some thin pliers and stuffed a cloth not to scrape it. Is there a more proper way?
On my fixed bridge AS93 it's easy 'cause you can use a screwdriver on the top of the peg.
Any suggestions?

Nah, I need the instant feedback when playing around with the action. I didn't mention I'm doing this while changing the string gauge so I'm also adjusting the trust rod and checking for strings bottoming out on the frets.

I have several archtops with bridges like the one you mention. Make sure both the bridge bottom, where it contacts the adjustment wheel, and the wheel itself are smooth. (When you do your next string change and can remove the bridge). I've had to use very fine sandpaper, automotive stuff like 2000 grit, and polish both pieces. Then before putting the bridge together a very small amount of teflon oil on the wheel. I can adust any of them now, even with heavy strings on without loosening the strings.