A similar tapering could be observed aft of Izzy, though the distance to the first heptad was greater, respecting the danger posed by Izzy’s boost engines. These heptads and triads were a bit like Lego or Tinkertoy parts, making it possible to cluster arklets together without much ado; hamster tubes were laced through their trusses so that, once an arklet was docked, persons and material could be easily moved to other arklets on the same frame. Adapters were also floating around that would facilitate nose-to-nose coupling, but these had been found to be not as useful as the hep and tri frames.