A hinge is a half of a trade. Any two adjacent couples or dancers who can trade can also hinge. Working as a unit, each couple does half of a couples trade to end in a two-faced line at right angles to the original line. Dancers do half of a trade with each other to end in a mini wave at right angles to the original mini wave. Couples use couple handhold and styling similar to wheel and deal.
Single hinge use hands up position.
The ends of the wave cross fold as the centres of the wave fold in behind the ends and follow them around, then face in to end as two facing couples. All dancers, arms in natural dance position, hands ready to adjust for next call as quickly as possible.