Secure your bow in a vise, clip on the String Level and adjust the vise
Until the bow is at horizontal and vertical level
Place the nock arrow on the rest and attach the Level to the arrow
Slide the arrow up or down on the string until it is level
You've now located the perfect 90° noc
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Very easy to use and is a cost effective way to set up your bow a small issue was that when you clip on the string level it's a good strong click but when it is on it is a little loose in its fit but I just rapped a rubber band around it and it stayed where I put it. Not really an issue but it was worth mentioning. My string is only 14 strands so strings with a higher strand count may not have issue. Regardless if I had to buy another set for some reason I would be happy to purchase them again. Good work Topoint