Based on our research into the equipment a grenadier carried, we found that the whisk and pick were carried with the U section threaded through a hole in the strap under the match case as shown in the picture of my gear. Naturally my depiction of the Grenadier from the First Royal Regiment of Foot doesn't have that detail. It could have been looped over a button in the waistcoat, but our unit direction is to have it carried on the strap of the cartridge box.