If you have a Matthews or a single cam bow, save your money it won't work. I purchased one and returned it because it was useless. I would check with your bow manufacturer before you purchase it. Matthews techs will tell you that it won't work.
I got one from the Bowhunters Superstore. they where the cheapest. Just remember they're only a starting point, if you can't get your centre shot by eye (I can't) I set the lazer up, get centre shot, then start paper tunning, walk back tunning etc.
I used a bowplane that provides 360 degree alignment. It got me very close to true but not as close as walk back tuning. I am constantly buying gadgets, using them and then putting them on the shelf. Sometimes the simplest method is the best.:wink:
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