Just tweak it and make sure both maximum length and minimum length are the same.
The same way as you'd use a piston
Get cod
You cannot.
you cant
use an emitter
With a scoreboard
Make a good level
Make a really good level
Use options to make it a favorite
Make a good level
Because you can make your own levels
a bump stop is a rubber placed in the shock absorber piston to prevent it form bottoming out.