Today I set the rivets that hold the hinges to the sides of my cowl and something unexpected happened. The two halves now fit too tightly together. I guess the clecos allowed things to move a bit so that the gap between halves was acceptable before rivetting, but once things were rivetted together, the gap all but closed up completely, and in some places was too tight to even get the hinge pin in. So how does one trim a few thousandths off of such an edge? If the hinge weren't there, a sanding block would make quick, straight work of it, but with the hinge there you really can't use a block. I tried, but all that happens is that skinny sharp edge removes the grit from the paper. What I really needed was something akin to a cabinet scraper. What finally worked very well was to attach some scrap hinge and pin to the area that needed timming. This would create a solid edge for me to run my mini scraper along. For a scraper, I used the side (not the edge) of a razor blade, with the actual blade running along the hinge. It worked just like a cabinet scraper and you could see the material coming off. Very quick and controllable.