I do a similar setup to you slim but I use a 3/8 s hook to the axle with G-8 chain (loadchain). I make my own swivels with 1/2" eyenuts and a 3/8" stainless ring that I bend that fits the collar. Gary Hammonds has bought 50 or 60 of them thru the years. Floyd Beaudroux and a whole bunch of other dogmen have told me my swivels are the best. I don't make em for sale anymore but in 35 years I have not had a loose dog due to my chain/axle/swivels.
I know what your talking about. I've got some that were made by Jack Partridge (SAGASA KENNELS) that are stainless. They are 20 yrs old and look brand new w/no slack.
