60 comprises a first component 60a disposed at the delivery end 39 of delivery arm 30 and a second component 60b disposed at the proximal end 11 of base 10 in rotational alignment with first component 60a the magnetic latch 60 holds delivery arm 30 downward in a latched position against the opposing upward force of delivery arm bias spring 50 one of the two latch components 60a and 60b is a magnet and the other of the two latch components 60a and 60b is a magnetically attractive material a trigger arm travel limiter comprises a trigger arm guide support 70 and a trigger arm guide collar 75 the trigger arm guide support 70 has a lower end 71 disposed upon base 10 distal of delivery arm support 20 and an upper end 72 the trigger arm guide collar 75 is disposed at upper end 72 of trigger arm guide support 70 and is sized to receive trigger arm 80 for limited rotation therein trigger arm 80 has a pivot end 81 pivotally connected to the base 10 by means of conventional trigger arm hinge 82 trigger arm 80 also has a trigger end 88 disposed generally above and for spaced limited rotation relative to delivery arm 30 hand trigger 89 is angularly disposed at trigger end 88 of trigger arm 80 for activation by the back of a hand h of quarterback qb the hand.