I have found a simple 555 timer circuit; however, I need to change the button mechanism to something more suitable. It operates with an on-off push button switch but I am just wondering how pin 3 output could be turned on and off with a momentary switch instead of an on-off. only because i can only find a momentary switch small enough (tactile) to suit my needs. If there is a simple way or another switch that would help? All i need to do is turn off and on pin 3 output with the smallest switch possible.