Used when a real riveting tool does not fit in the slot. - A drop of oil on the clamp screw helps a lot. This is not intended to replace an original rivet nut tool. A real rivet nut tool pulls straight compared to that little screw that has to turn and slide the threads against each other to pull the rivet. Threads on the fairing = more friction and also wear. You can't expect it to do the same job as a professional riveting tool, but whenever I needed it it worked fine.