You will also notice that due to the cutting machine, the ends of the tracks have a slight dip to them. If you connect two straights, place a straightedge on the top of the rail. You will see that the joint dips down. I sometimes will place a shim at that point so when I screw the track down, it will reduce the dip.
I also have a small one inch continuous belt sander which I use to true up the ends of the track.
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