cornfed
Mindless lemming
Some of the old Pioneer wings did not require a single tank adaptor, ie STA-less wings. The cam straps feed through corresponding slots in wing and BP and pressure from the straps held everything together. The wing had little rods running down it to help align the tank. The new Eclipse wings (and I think newer Pioneers) need an STA. The wing goes between the STA and the BP and everything bolts together nice and secure.