These are the parts I used for, what I call, a springboard.
I glue and screw the spring to the base on both sides. I use 2 countersunk head machine screws through the runner, 2 washers and 2 knobs to mount it in a miter groove. Adjust it where it is in contact with the material with a little pressure and when the knobs are tightened the countersunk screws spread the sides of the runner and clamps it into the miter slot and holds the base in place.
You can also make these and just glue and screw the spring to the leading edge of the base. The spring can be any length and can be a little thicker (like a single finger feather board).
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