My sub2k gen 2 in Glock 9mm that I bought 9 months ago has the original sight on it. ( and is slightly canted to the right from the factory). I was thinking about driving the hour over to Kel-Tec to drop it off and have the updated sight installed. The question I have is what keeps the updated site from spinning other than maybe some factory installed lock tite? It has no set screw as on the original sight. I know the updated sight has the thread protector nut and washer to keep it from backing off, but what stops it from spinning the other way?