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The handle on this model has a set screw in the back you have to remove the set screw then pull the handle off. Here is a link to the parts blow up so you can see how it goes togetherhttp://www.moen.com/product-support/aberdeen/oil-rubbed-bronze-one-handle-high-arc-pulldown-kitchen-faucet/_/R-CONSUMER%3A7590ORB?catalogSku=CONSUMER:7590ORB#iframe://docs.google.com/gview?url=http://www.moen.com/shared/docs/exploded-parts-views/7590pt.pdf&embedded=true
That is the exact same model as shown in the link. The set screw is covered by a plug. It's in the back of the handle not the top. Did you check out the exploded parts view in the link I sent?
if you still need assistance let me know. that allen wrench is usually not a standard size. but if your having trouble finding that wrench i can refer you to a moen part number that includes a new wrench and usually pretty cheap for the kit. just let me know and i can proceed with part number that includes wrench you need. i also know these moen faucets pretty well if you need any other help. my company has been installing moen products since 1957. thanks
well you did the right thing it sounds like. I usually use a razor blade on those caps. If you need any further assistance let me know. If you ever have to replace the cartridge or o rings i am very familiar with doing that. Hope it all works out. Also moen is very helpful through there tech support line. Have a good day.