need help finding adjustable roof cutting saw

[T. Faull]

Can anyone lend me a hand. Our dept. has a stilh chainsaw. We would like to purchase a saw that has a adjustable depth sellector on the bar but we don't want to shell out $1500.
I'm sure I have seen a ad for bars you can retrofit to existing saws. The touble is am unable to locate them now. Has anyone done this retrofit,or do you know where I could find info on this

Thanks and stay safe

[SFD-129-3]

try www.cuttersedge.com . I believe they offer their depth guard as an add-on.
I think the other set-up was the ventmaster. Good luck.