I have a gas valve number 704504K.Its a valve that can only be turned by 1/2 turn maximum.I am looking for the correct spark switch for it. I do not have a reference to the previous switch, but it looks like switch 704512 would work. The switch is described as firing at 160 degrees.Can someone confirm that this is the right switch ?is the 160 degrees measured anti clockwise or clockwise ?The knob on my switch only turns anti clockwise.