I have an interior wall with a one-gang light switch; it contains a dual dimmer. I'm trying to change this to a single dimmer, and to add a new switch (to drive the other load) on the opposite side of the wall. Here's a sketch(-up) of what it looks like now:
Some feeling around (as much as I can) seems to show the following geometry:
In other words, the existing new-work box seems to be cut into the horizontal stud. The other side (where I want to install a new switch) looks something like this:
So, finally, to get to my question: I want to install an old-work box about here:
Is it feasible to remove some of the horizontal stud, ideally without having to do drywall repair? For example, I have a Sawzall; can I just use that to carve through the front part of the horizontal? Any other tips?