I don't have good luck with these double edge trimmers. It is one of those five minute tools that allows you to finish up five hours later.
I generally, use a razor knife or an EXACTO Knife to trim the edges. Start at the end and hold the blade as flat as you can and run it along the edge of the piece. Angle the tip away from the direction of travel and keep the pressure towards the banding. The banding is thin enough that the knife blade should be more than adequate. You should get a very fine curl of material being sliced off. You may have to make a couple of passes to ensure it is flat to the surface.
Then, use either use a block plane (set really shallow) or a piece of fine grit sandpaper on a backer (piece of wood) and break the edge a little. Again, pressure towards the banding. Never cut towards the banding as it may break it loose from the edge. The sandpaper will, also, allow you to get into inside corners.
Hope this helps.
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Last edited by schnewj; 09-13-2016 at 09:28 AM.