BTW Thierry, that Acco swivel is your weak link. All the catalogs say "Engineered to meet the workload of ACCO 1/4" and 5/16" grade 40 high-test chain (3900 lbs)" but that's misleading. Look at the WLL stamped on your swivel, and if it's like the one I bought you will probably find it is quite a lot less than that.