You might contact "MikeSr", he was the one that designed the monster"holesaw". There maybe two circulating and he usually knows where at least one is. My advice would be to use at least a 1hp hd drill. I used a lttle 1/2 B&D drill and it didn't have quite enough ooomph and the holesaw kept getting hung up and the drill would quit. The first baffles you can get out with just a drill, but the second set you need the holesaw. Goodluck!
-PES
