This is a circuit that I designed, that makes a lever, when pressed act like a button, by the fact that the output will only emit a single pulse.

To change the length of the pulse, you can change the delay on the repeater. (currently set to a 3 tick delay)

For 1 tick pulse = 1 tick delay on the repeater

2 ticks = 2 tick delay

3 ticks = .3 tick delay

4 ticks = 4 tick delay