I had to replace an old Peugeot seatpost that was stolen with the only thing available, an alloy post. The size I need to fit is 25.6mm [edit:24.6mm], according to my calipers. The post I got is 26.0mm [edit:25.0mm]. I've been sanding the sucker down by hand--with the coarsest grit sandpaper I could get at the hardware store--and it's taking forever. I can just barely get the bottom of the post inserted into the frame. I don't have access to a lathe, but a neighbor said he had a hand grinder. I'm wary of using this, however, as I assume the grind will be uneven. It's not a lot to take off of the post, but I don't have the energy, free time or patience to keep doing it by hand. Any suggestions on how to speed this one up?