Hohwaiian, Nope the swivel has never opened. If you pinch the lead thin enough it will break off if you snag up good.

LeadThrower, yeah, with the chainswivel it is big, another reason we switched to the small barrel swivel.

WA BowHunter, I used to tie up the rig that way, but where you have your leader tied on is the only problem i had with it. With the lead bouncing around, the area where the swivel clips onto the clasp, where the leader is now, jiggles and chews up the knot. The main reason for adding the second barrel swivel.

I still like fishing with a float better.
Here chummy chummy chummy.