I have cut a hole into an old lath-and-plaster wall for an electrical switch.
I used a drill, followed by a drywall saw. Despite being very slow and careful, the lath is now loose from the plaster. This is how it looks:
Unfortunately the hole is not big enough and I need to saw off a little bit more. I try to push the lath to the plaster while sawing to minimize movement but I am afraid it gets too unstable and plaster will break.
How do I best stabilize lath and plaster to avoid more damage?
How shall I proceed to enlargen the hole?