Delbert Hall, ETCP certified rigger—theatre and ETCP recognized trainer, of D2 Flying Effects did some personal testing with three different swaging tools and sleeves from three different suppliers in order to answer the question: Is there a difference between swaging sleeves and can you use any brand of sleeve with whatever brand of swaging tool they may have? The results, while not meant to be conclusive, make some interesting reading for riggers. His research is posted at http://www.delberthall.com/loadlab/swaging.html