I have the same problem and I think I know my mistake. During one of my repairs I lost the washer that fits over the top of the 1225 cartridge stem. It's the same washer as shown at 4:18 of this video of a slightly different Moen faucet: https://youtu.be/ng484pwhBRI
I have ordered what is think is the replacement, I'll see how it works.
SOURCE: moen shower handle keeps turning it wont come to a stop
Yes it is fixable and easy.To save you time because I belive you will be needing a new part from Moen I am sending you this easy link to quickly resolve your issue. Just be sure to tell Moen you are original owner of faucet and all parts are lifetime free including shipping. Go Moen!!!
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http://www.moen.com/contact.cfm?location=TopNavCustomerSupport
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SOURCE: how to remove the handle of a monticello 4551 moen
grab bottom of handle,(the fat part of handle closes to faucet body) and grip hard and turn counter clockwise to get to cartridge. dont use channel locks pliers or you risk damage to finish. can be done by hand and very tight grip
SOURCE: Moen Single Handle Shower Faucet leak...
the cartridge if defective,replace it and your leak will stop.
SOURCE: I am installing the valve housing for a moen
No...the (cotter pin) is a retaining piece for the cartridge. If you remove it the cartridge can blow out under pressure.
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SOURCE: I have a loose handle on my Moen two hanlde
Take handle off and check out the inside to make sure it not striped out and on the top of the handle it may have a plastic cap to pop of to access the screw holding in in place you amy have to use a knive to get it off .
If you can't see a set screw it may have a screw in handle on top.
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