From Halcyon, an innovative solution to a V-weight is the new V-weight pouch. This pouch features two pockets with hook & loop closures that will fit your individual weight requirement using soft weight (lead shot) pouches. The upper pocket will fit 6 - 8lbs of lead and the lower 4 - 6lbs of lead depending on the size of the weight pouch.
To install, simply disassemble your wing and back-plate from the doubles (twin set) and install the weight pouches on the weight bolts with the smaller pouch to the bottom. You will need to work the shop in-between the tanks. The install your wing, then your backplate.
Perfect for wide-manifold style D7 or D8.5