On the one i got, those 2 black thumbscrews that screw into the jig, to hold in the pin and hold down the wire, they're made of plastic, not metal, and the jig arrived to me with both knobs snapped off, leaving the threaded part inside the jig.

FT refunded me pretty much instantly, amazing service.

Just a cautionary note. If the thumbscrews on your jig are also plastic, then be careful with them; evidence indicates they're fragile.

The jig otherwise seems nice.