Update: After the previous check, the seller contacted and sent a second set of switches, they all have a smaller diameter knob, and the nut and washer are removable Build quality is still good, review updated. OLD REVIEW: Good job, but the red knob is larger in diameter than the nut and washer so they can't be removed. If you have a U-shaped mount, no problem, but if you have to put the button through the hole, it won't.