Air Venturi Help with Avenger repair

I live in Phoenix area and assumed Airguns of Arizona would be able to fix the air leak in my Avenger, but they said they won't work on Avengers. I have the O ring kit, I just need some help getting the gun apart (I don't the right tools and am admittedly not the handiest at this type of thing). Anyone know of someone that may be able to help me in Arizona as I would like to avoid shipping the gun? Any chance a regular gunsmith could help?