Before revision: Gunpowder driven glass breaker Larry Goodman's safety glass breaker has many similarities with a spring-loaded glass breaker, but instead of relying on a stored springforce , it depends on detonating a .22 blank cartridge with a spring loaded firing pin, driving the glass striker with the help of expanding gases rather than spring tension.
After revision: Gunpowder driven glass breaker Larry Goodman's safety glass breaker has many similarities with a spring-loaded glass breaker, but instead of relying on a stored spring force , it depends on detonating a .22 blank cartridge with a spring loaded firing pin, driving the glass striker with the help of expanding gases rather than spring tension.