Section R. 408.12431 - Single strokeRule 2431.
(1) Presses using full-revolution clutches shall incorporate a single-stroke mechanism, except that the single-stroke mechanism may be omitted if either of the following conditions is met:(a) A press has barrier guards as prescribed in R 408.12462(1), (2), and (3) on all 4 sides and a second action is required to initiate the cycle after the machine has been energized by the start switch.(b) A press is operated by 2 hand anti-repeat trips.(2) If the single-stroke mechanism is dependent upon spring action, the spring shall be of the compression type, operating on a rod or guided within a hole or tube, and designed to prevent interleaving of the spring coils in event of breakage.Mich. Admin. Code R. 408.12431