i see all kinds of brakes on the market and was just curious as to what angle should the ports be drill on the brake with just holes and at what diameter. with all the experience around here, someone must know what's the most effective design and what the angles and holes sizes are. alot of brakes are added right into the barrel and some are screwed on that are almost invisible to the barrel diameter with just holes, so i was wondering why there are so many that basically look alike but what makes them different ?? hope i asked this correctely ??