So I am installing a used Whelen dash mount siren & realize WTF kind of screw or bolt am I suppose to use that will fit/slide into those damn tracks on the side & not spin when you put a nut on the outside :?:
Looked at a local hardware store & couldn't figure it out so someone tell me what am I suppose to use :?:
Looked at a local hardware store & couldn't figure it out so someone tell me what am I suppose to use :?: