You can cut down Tangles on Mono Hooklengths by using PVA presentations, either a Stringer or a Bag.
Some rigs tangle on the retrieve as you pick up the Lead, yet in the water they are Untangled, so it appears you may have had a Tangle, yet you didn't.
Because the Lead is in the middle of the coil as you pick up to retrieve, the Hooklength tangles around the Lead. :D