The feet are not there to prevent side to side movement. They are there to
prevent the miter thingie from lifting out of the slot. You can use a washer
or even a flat piece of 1/8" metal for this purpose.
To prevent side to side slop, drill two holes in the side of the runner. One
near the front and one near the back. Put a short set screw (find one with a
relatively flat top) into this hole and screw it down enough so that the
runner barely fits into the slot. If it is too loose, back the screw out a
bit. Too tight, screw it down.
Oh, I indeed thought of it. I was not the first however. I've seen something
like this before.
Things like the lever, the screw and the wheel have also been invented
before, but there is always a new application for them.
Support the bar solidly, and take a punch and dimple randomly along the
length. The raised portion of the metal will grip the sides of the groove.
You can do as many or as few as will do, and sometimes it's machining in the
bar, so you only need them in the low spots.
It's like placing lots and lots of set screws on the length.
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