Whacky:
Got 1 and 1/2 inch lengths for my threaded gliders and am glad for the extra length.
When you put them on, you have to tilt the box a little to remove one set of the older feet and add the new ones. The Herbie feet will not accept too much tension on the outer portion of the circle; so its best to screw them all the way in, then tilt the box for the other set. Once that second set is installed at its final height, you can retilt the box yet one more time and raise the first set a second time to match. Doing it this way removes the chance of breaking the outer edge of the rim.

