I fit it on my SS 500 table and it eliminates side to side play, and moves freely. I also fit it on my contrators saw with a wider slot, and it is also eliminates side to side play, and moves freely. The packaging states that is is adjustable in width from .730 to .785. It is 5/16" thick. Also specifcally refers to Shopsmith as one of the slots it will fit. As far as fittng Shopsmith, mine is set at the samllest setting. "Made in USA".
I will report accordingly when I make the cross cut sleds; and, I anticipate they will work great.