Com: petten : there is no spring, they use the energy of the blade itself grabbing the aluminum block to throw it below the table. I know that they tried a number of alternatives and this was the only one that worked reliably and fast enough to prevent serious injury which was the point in the first place..

Com:Aaron dozier: Destruction or not, id rather kill the blade then losing a finger. Looks more like a automatic emerngency stopper. Like they do with gas stations..