Airlock strike indicators are as easy as it gets. Pop your leader in the groove and re-attach the nut to the top. Unlike with other systems, your leader stays in line. No matter how many times you adjust your depth, your leader wont get kinked and compromise both your presentation and leader strength. Adjusting your depth is a breeze. Loosen the nut at the top, slide the indicator, then tighten it backdown. No loops, knots or kinks!