Picked one of these up, after using it I have to say that it is a great product. I hate using the plumb bob method. I got my 2nd and 3rd axis fixed in a hurry, about 5 min. $90 is kind of pricy but it is all metal and should last for many years. I would highly recommend this to anyone shooting an adjustable sight. Just wanted to pass on the info for anyone on the fence.