I FIGURED IT OUT!!!!YAY.
the piston comes out easily with a pair of plyers.hold the cover on your lap upside down, smart mix knob closest to you,there is a slot for the piston to fit in to, turn the knob slightly (about 1/2") you will see that you can lift the knob slightly out of the way then you can slide the piston into place. leave the knob at that position to hold the piston and slowly put the cover back in place. if the piston goes in,just before you put the cover all the way down turn the knob back to water only.if everything is in place, PUT THE SCREWS IN!!!! hope this helps.
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Make sure that the piston on the bottom of the smart mix valve is in the water only position.(needs be be on the knob and not sitting in the hole). With the top off, it is easier if you have a block of wood or something under the base to hold it up. Other wise it drops down and the screws can't grap the base. Also make sure all hoses aren't being pinched.
The cap and insert at the bottom of the bottle may need to be replaced, or you could have a problem with the smart mix asm. You would have to remove the top cover to get to it. Does the smart mix knob stop where it is supposed to or does it go all of the way around, if it does, then the stop on the knob is broken.
Did you put the piston on the bottom side of the smart mix knob? If not, put it on, then turn it slightly so it won't fall off. Just before putting the top cover on, put the smart mix knob in the water only spot, then push the top on and make sure that the knob turns back and forth ok. Secure the top down, and put the flow indicator on. Sometimes when you over tighten that cap, it doesn't want to spray right. So just snug it. If you haven't pinched any lines on the base or inside the handle, it should work. Could also be that the flow indictor cap is bad. MAke sure the gasket at the bottom of the tank is on the valve and not sitting in the hole.
The piston is put on the bottom of the smart mix knob, turn the knob to the water only setting, then put the top housing back in place making sure that the piston went into the slot, after the top is all of the way down, turn the knob, if it turns easily, then it is in place.