Review on Efficient Expansion Internal Fastener: Stainless Lifting Simplified by Trey Michaels

Although the screws appear to be well made, there is a design flaw that makes their correct installation very difficult. It is a three-piece bolt that includes a removable eye, a threaded stud with a flared end, and then a bushing that covers the stud so the end of this bushing expands towards the surface of the hole when tightened. The problem we had with the installation is that the sleeve is too short. When the dowel is pulled into the hole, the threaded bolt protrudes further and further out of the hole. In order for the anchor to work, drill a hole first, there are no instructions for the anchor, so you'll have to experiment to get the drill the right size. So the bolt must be inserted into the hole and the hole must be tight enough. In order to get both the bushing and bolt in the correct position in the hole, you will need to tighten the nut on the bushing to hold it in place. You then drive the anchor into the hole and begin tightening to expand the sleeve. Then one of two things happens: either that nut gets stuck in the hole, requiring you to add a second nut to tighten the loop end, or else the studded threaded end sticks out too far from the hole to tighten the loop. end on the masonry surface. Very frustrating.