I put a rebuild kit in but i guessed i lost the spring when the nut that hold the spring/ball/power piston came loose and dropped into the bowl.

i have two diff springs in my rebuild kits left , i pretty sure it is one of these thats goes below the power piston.

Does anyone know if its a small, cylinder shaped, very stiff spring Ive seen called a power valve spring, or is t the spring that's longer, and tapered soft? thanks again