Military Officer & NCO Whistle Strap Chicago Studs/Screws
Brass Chicago studs, used to secure the leather whistle straps to the whistle, prior to WW1 and up to and after WW2. Used on several types of whistle strap.
Made of solid brass and simple to use, just feed the strap end through the whistle loop and screw the two studs together to secure.
You can get fitting instructions on this link.
You can buy the straps here.