Hi Rusty
Brass is best but you can use this llittle trick I use and it works.
Go to the tool box and get out the Blue-Stuff or clear stuff (silicone) put a dot or two on the threads of the template guide, now rub the silicone into the threads now take a rag and wipe the threads clean, because of the V-Groove of the threads you will not get all of the silicone out of the threads but it will fill the base of the groove with a light coat of non locking silicone, now let it dry for a bit and the next time you go to use it they will stay in place.
When you use brass ones the threads will deform just a bit and that's why they lock unlike steel one that can't deform with out high torq.
Bj
