I have a moen shower control that drip leaks when off. It's a pull knob for on/off, rotate for hot/cold. Its an all chrome unit. I need to get into the wall, but I cannot figure out how to get the knob off. There is no set screw, and I've firmly messed with it, but cannot figure it out... any help out there?.

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Originally Posted by ;

i cannot figure out how to get the knob off.

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The insert on the knob pops off, (see image) and you unscrew the screw,
Shut the water off and open up the valve and replace the cartridge, Clicking on;http://www.moen.com/consumersupport/...3/moen0133.cfm
Will get you to a installation guide for replacing a Moen cartridge. You can get a new cartridge from Moen for free call them at 800-289-6636, While you have the valve open turn the water back on for a moment to flush out the supplies. Rerassemble and test. Good luck, Tom