Quote:
Originally Posted by brianhejh
I have finally bought a good quality slotted straight edge (stew mac style)...
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One plays the tops of the frets. To a very large extent using a straight edge that registers the surface of the fingerboard is irrelevant. There can be some irregularities in the surface of the fingerboard, but as long as the fret tops are level, the instrument will play fine. The converse is not true: a level fingerboard with unlevel frets will often buzz.