Yes there is very easy to put together
Yes it Will work on most spark plugs that you find on lawn eguipment .
I used it for the Honda plug but I needed a crescent wrench to turn it.
Simply push in opn BOTH of the spring-loaded "balls", which are connected by a "V" shaped spring, then pull the two sections apart. You need to push pretty hard, the V-spring is very strong!
With a little wiggle and effort mine came apart.