On 4 May 2005 14:34:42 -0700, "Mike in Arkansas"
wrote:

Before using
the sled, I took a file and went down the corner top of each side of
both slots. Just three or four passes at 45 degrees or so to slightly
bevel and smooth out any dings. Bevels are barely visible but I think
give a better and broader surface for the casters to ride on. Mike


that riding on the corner is a no-go for me. the miter slots have 2
machined index surfaces each- the sides of the slot, perpendicular to
the top, parallel to the blade. they have enough area to provide
accuracy for a reasonable lifetime of the machine. now you've gone and
created another index surface, none to accurately, with a lot less
area, and you're riding it with a curved follower to boot.

consider this:
what happens when that surface gets a ding in it?