What to sand/grind with?

[ojh]

What do you guys use to do the very fine work, like when grinding the pride for perfect sheetmetal and you need to get right THERE. I've been trying to use 2" rowlock, 80grit, on a 90deg die grinder. I use just the edge with good resukts but is get soft quick an dthen I use scissors to to trim the edge back to the rubber backing to firm it up. But I still touch the adjacent metal. I've tried and use the edge of a cutoff disc but it can leave little unwanted divots.
What do you guys use?