You pretty much have to use a negative (talking Hammer style) grip on a overhead bar. The body must be allowed to twist some as its being lowered. That's the natural function of the wrist/elbow/ and bicep, they all work together,allowing a twist. Works very well with gymnastic rings, which I use. Gripping a ring may take some getting use to, for a few guy's. Helps develop the grip also.
Can use a overhead cable, with a turning handle, for regular one arm pulldowns or negative holds/lowerings. Develops strength and affects the lats greatly. Lot of women prefer this method over regular chins. Good Luck