This system assures perfectly centered vessels every time. We start by turning a dissolution vessel on a lathe and grinding a concentric ring around the outside of the glass vessel. Next we fasten a centering collar around the ground ring and place the system into the alignment plate. The result is a vessel that can be perfectly centered. Once your vessels are in place, they will not float. This system can be retrofitted to any existing VK 7000 or VK 7010 Dissolution Apparatus.