There’s no point in using a bulk down the line for summer carp on the waggler, as I want the hookbait to fall slowly and give me a chance of picking up fish on the drop.
I fix three No8 shot evenly-spaced down the line in the bottom half of the rig. These give the bait that slow fall and help straighten the line out when the float lands to cut down on tangles.
The rig also uses a tiny swivel that reduces line twist when winding in but also lets me quickly change hooklinks from one with a hair-rigged band to one with a plain hook.