To Add to my previous post when we first used the 'helicopter' named by that great angler Alex Welland we used the bomb at the bottom, short length of tubing forced over the eye of the bomb.
On the tubing rested a fixed bottom bead, swivel with hooklength, and fixed top bead, the tubing was about three inches in length. This was to prevent Multi-strand from tangling on Frampton water in Gloucester a hard bottomed gravel pit. We are now in 1992 .
When I joined the Mangrove some years later 1998 the members had taken Alex's rig and improved it to fish over the silt. The bomb was still at the bottom attached to a spliced loop in lead core, bottom bead still fixed but six to twelve inches above the lead, a swivel and hooklength rotating above the bottom bead, top bead loose with a power gum stop knot six inches above the top bead resting on the swivel.
The lead core was spliced with a loop at the top and total length around three feet. To avoid tangles more mass (weight) was required on the hook
so a simple stringer was attached. The extra weight made the hooklength revolve in flight hence Alex's helicopter.
The end result with a critically balanced bait worked like a dream and the bait more often than not came back not dark and smelly.
There can be a danger that if casting a PVA bag on a free running swivel its weight could run thirty feet and even more up the line, without a stop knot this can happen, a bit like a flying back lead. On the other hand this may be an advantage depending on where you are fishing.
Finally apologies to you Rodney I thought that you were referring to Matt scoffing.....my excuse....?.....
well its been a hectic weekend so sorry again.