Over the past few weeks I've been taking my shooting a lot more seriously and surprisingly enough have actually gotten fairly decent at it. I broke my first 2 bobbers at 20 yards the other night at the local pro shop which was pretty cool.

My only concern is that my Cobra Sidewinder site keeps moving to the left no matter how tight I seem to get the screw the holds it in place. About every 20 shots or so I will notice I'm hitting about 1-2 inches to the left and when I look at my sight it's not in the same place. I don't get it - the thing is tight as can be and I can't move it by hand but it seems to just scoot over ever so slightly and then stop in the same spot. I look at the dovetail and it doesn't look like there's any grooves in it.

I would rather not spend the cash on a new site right now simply because I like the one I've got and it works great. Any tips or tricks on how the heck I can get this thing to stay put?? Moving it over one bar every 20 shots is getting to be a real pain in the butt.