For almost everything I use a strap with a buckle, so the length is fixed. Once I find the length of each horn's strap it never needs to change, in fact it's troublesome to do so which keeps them at the right length.LOL. Loved Dave's constantly adjusting guy. But I just have a strap for each and leave it on the horn. No adjusting required.
Side benefit for someone with a long neck playing Conns is that you don't have to pull the slider up to strangulation length.