Help trying to replace leaking O-ring in Moen Traditional kitchen faucet

I'm trying to replace a leaking O-ring on a Moen tradition kitchen faucet. Trying remove the spout and can't seem to loosen the base that holds the retaining and O-ring. Is there some trick to doing this? Is it just screwed on?

http://www.moen.com/replacement-parts/product?product=IMGLIB:87990

Please help.

Madison

 

Also, I was using a big 8 inch Husky strap wrench to unscrew counter clockwise.

 

Never mind......I got it. Wrapped a towel around it and tap it lightly with a small hammer then used the strap wrench.