Reply by MonteCristo

Miter cuts always need tweaking to close perfectly. No matter how much you fiddle your set up, there will always be some error, albeit very small with a good set up. One trick I use on the miter saw is to use a very thin shim(s) to shift the opposite end of the board to the end being cut. A guy can make super small adjustments to the angle this way, far finer than that by trying to tweak the setting on the saw itself.

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