Jack,
As follow up to Don's reply -
I used a 60-tooth, thin kerf Freud blade (10" table saw). The slots are a slip-fit (snug) on the rails, so you have to get the distances just right. You can use an 1/8" kerf blade, I imagine, and have a little looser fit, and it wouldn't hurt.
I used 4-1/2" center distance since that is my curve spacings (Ø108-Ø99), but you can make your gauges to fit your spacing, as Don mentioned above.
Alex
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