In American English, the mouth placement represents the vowel phonemes found in the words see and her.
The mouth placement is located near the corner of the mouth on the same side on the face as the cueing hand.
In general, the point of contact is the tip of the longest extended finger of the handshape. In the case of handshape 8, this remains true. The middle finger is the contact finger for the mouth placement (e.g., chirp, yearn, yeast) so that the other extended finger (the index finger) points away from face and does not cause ambiguity as to which placement is being contacted.