Add Road Rage to Roger Mayer Classic Fuzz?

[Jakes Dad]

Got one of these cheap-ish:

Supposedly didn't work.  Biased it and cleaned up the drive pot a little and it works pretty good.
Guts aren't what I expected for a $200+ Handbuilt in the UK pedal but it works and sounds a little different from other Germanium Fuzzes I've built - and it comes in a space ship!
Guts:

I'd like to replace the battery with a 9v jack and a Road Rage but I'm a little frightened by the butt simple wiring in this thing. Is it as simple as connecting the black wire to the RR's -9v pad and the red from the input jack to the RR's G pad?

Chuck