Tying down your revolver is important. Whether single-action or double-action, it's important to make sure that your handgun is secure in your holster. Generally, the holster maker uses a simple strip of latigo, probably cut from the same leather as the holster was cut from, to form a simple loop to tie the holster to the revolver. Sort of like this:
I own holsters from several custom makers, to include Mernicle, Ken's Leathercraft, El Paso Saddlery, and Crease N Corral. In addition to a couple that my son has made for me. When I was at the invitational last week, I was running a holster from Ken's Leathercraft. I like Ken's work, but for some reason I kept getting the front sight of my gun stuck in the loop as I drew the revolver. The loop was just a bit stiff, and stood proudly from the holster when it wasn't holding the revolver. Sticking the front sight of your revolver in your tie-down is a sure-fire way of slowing your draw.
Luckily, the proprietor of Crease N Corral is a friend of mine, as well as a first class Fast Draw competitor in his own right. We call him Part Time, and he's come up with a little fix for the tie-down problem, and it's easy enough that anyone can replicate it in just a few minutes with a piece of leather. So, I went out to the bench and cut a strip of scrap leather to make a tie-down