Has anyone got any good suggestions for old work boxes in plaster walls. I am updating this old house and some of the wall that I cut in boxes are 1 1/4" thick. (1/2" plaster over 3/4" tongue and groove) Most o/w boxes are only good for 1". I just recently got some Arlington boxes. Anyone ever used these? How do you like them?

What is the preferred method of cutting in o/w boxes - Sawzall, rotozip, keyhole saw, ????