Can I work on a website I didn't design?

They call me Website Dave because I make websites. I am often asked if I can go in and work on or update a site that somebody else built. The answer is “yes” and I am introducing a maintenance program that makes it possible and easy to have someone work on a company’s website, even if I’m not the guy who built it. For a low monthly fee, they can have a website guy in their back pocket who can make the small and quick changes to a website without the stress of 15 minute minimums every time a web guy lifts a finger. So now, companies who love their websites but hate their website guy (or can’t find their website guy) have a way to get their websites updated without a whole bunch of hassles.