Here’s a featherboard that locks into your table saw’s miter slot so you don’t have to fumble with clamps to hold it in place.
To make one, saw a 45-degree angle on a 5-in.-wide x 15-in.-long scrap board and then cut the slots with the band saw, leaving 1/8-in.-wide x 2-1/2-in.-deep “feathers.” Saw parallel 1/4-in.-wide slots into the featherboard 2 in. apart, stopping them 2 in. short of the feathers.
Now saw a 1/2-in.-thick strip of hardwood a smidgen narrower than the miter slot (so it slides without wiggling). Drill and countersink 1/4-in. holes in the strip, spaced to match the featherboard slots, and attach it to the featherboard with two 1-1/2-in. x 1/4-in. machine screws, wing nuts and washers.
Create the “strip-lock” by drilling and countersinking a 1/4-in. hole centered 1-1/2 in. from the end of the strip. Saw a slot lengthwise through the hole and slip in a 1-in. x 1/4-in. machine screw, wing nut and washer. Tighten the wing nut and the end of the strip will fan out, locking the featherboard into the slot and holding it solid while you saw. Thanks to Larry Minish for this tip.