well done brimmer, replaced the collar on my mk3 the other day, with a nylon cat collar, far better than the original, it holds the two halfs of the transmiter tighter as i find it can work a little loose after 2 years or so's worth of use!!!! and also you can make it as tight as you like, with there being no holes in it, you just poke the buckle pin any where through the strap, i'll get a pic up for all you mk3 users