I'm wrenching on a beater SS I picked up today for $5.
I've got a stuck, rusted together middle/outer chainring bolt -- the kind that threads into the nut on the inside of the spider (double-stack bolts here). I've doused it with penetrating oil and all that, but it just spins instead of unscrews.
There's that slot in the back, of course. Holding it with a flathead screwdriver isnt' helping. There isn't some special tool for this, is there? I've always used a screwdriver, just never had one so tightly stuck.
update-- never mind, spoke too soon. got the bolt out.