I have a Jim Chambers Colonial Virginia lock and wondered about installing a brass flash guard that I was given some time ago. I am not familiar with flash guards and wondered if I simply remove the exterior frizzen screw, put the guard over the hole and reinsert the screw? Or do I need to get something else --- I saw TOTW sells a flash guard frizzen screw and nut set. Looks like a longer screw that has a threaded stem on top. I guess the guard goes over the stem and the nut over that. Appreciate any info on the guards.