There’s nothing wrong with making your own featherboards from scrap. The challenge is figuring out how to mount them securely to your machine surfaces or router table. Here are two alternatives: Rockler sells a Miter Slot Hardware Kit for $6.99. You get two expanding bars, bolts and star knobs to install featherboards the conventional way. Another solution is Magswitch’s MagJigs. They’re self-contained 20mm or 30mm magnets ($26 to $38 each) with a mounting bracket and knob that turns the magnet on and off. Attach them to featherboards when needed and then swap them over to any other table-mounted jig you make.