What should the reset button on an old Wedgewood feel like?

I've got a Wedgewood stove in pretty good shape. Four burners, griddle in the middle, oven on the right, with warming drawer below, and broiler on the left, with storage below. The two gas safety valves are at the back, below the burners, on the left and right side.

I pushed the button on the safety valve on the left, thinking it goes to the broiler, and the button feels like I'm pumping oil - very "viscous" feeling, and doesn't pop back out afterwards. I didn't want to mess with the one on...

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via What should the reset button on an old Wedgewood feel like?
by Calor