No need for leadcore in the first place
Try not to use a leader of any kind if you can help it. It's much safer for the fish without one.
Taken from the following thread, which also has links in it worth reading:
http://www.carp.com/carp-forum/viewtopic.php?t=45812&highlight=chod+silt+bead
Basically I tie mine as follows.
From Lead, all mounted on the mainline:
Lead (with swivel cut off) – weak link of low b/s line – large eye swivel – Korda shockleader sleeve – the rig – ESP shock bead – slim float stop (set to required depth)
In the picture I have not used the weak link as there was a clean bottom with no snags present. If there was weed in the vicinity or any sort of snaggy areas then this would be incorporated in the set up.
I don’t use this rig when fishing into weed but I am working on an idea.
As an extra safety measure I have now switched to using a slimmer float stop so the ESP bead will pass over the stop under pressure.
If this fails then the running large eye swivel that the rig is mounted on will pass over the bead under very light pressure.
I use the shockleader sleeves to stop the swivel and line working at horrible angles whilst playing a fish.
It also lets the rig sit nicely during the cast.
If there is a pretty much uniform lake bed out to the area fishing, I will sometimes use a flying backlead and / or backlead. This gives that extra bit of resistance on any pickup, if required.
I do however, find that a slack line approach works fantastically in most situations as the set up has predominately been used as a single bait approach.