I have a brand new Price Pfister shower/tub set with single handle control.

It had been working fine for about a week and a half. Right after a shower, the diverter on the spout released itself then a white piece of plastic *fell off the spout.

I found 4 parts to the diverter: a white plastic piece, a tiny black washer; a silver "stem", the screw-on knob or head.
I tried to unscrew the head and reassemble it back into the spout, but the diverter wouldn't stay in the "up" position.

All the research I've read says I will need a new spout. Is that true?