I can honestly say that the product did eliminate those irritating squeaks. In fact, I ordered two more kits and plan to order several more to complete this project. I'm not too impressed with the work of our home building contractor, since our home is only 7 years old, but that's another story. At least now, I can take care of the problem myself with your product. We've tried driving screws up through the subfloor - again, no luck.
Chances are the squeaks come from inadequate fastening of the subflooring.
But you probably don't have to take up the flooring to take care of the problem. I had previously used a competitors product in 2 repairs. The squeak-relief piece of hardware did the trick for us on a recent job to the immediate satisfaction of one of our favorite clients. We purchased two pair through a catalog on a lurk to see if they would work and since installing them, we realize that we should have ordered more of them. This device aligns the fence with the saw blade to assure you a measurement from fence to saw blade, and the blade height.