The Monorail. Left hand or cello hand.
Take your middle finger and place in-between the D and the G string, have the fingernail facing the bridge and the finger tall. Now pull the finger back to first position and place the thumb directly underneath the second finger to make a round shape. Now ‘blob’ the fingers all in a line on the fingerboard in-between the strings. Remember to keep the wing up high and support under the wrist. Then lean the fingers back a little off center so the fingers can ‘fan’ out into position.