Greg this is a book that you might like to find. It has allot of information about setting up and types of superchargers. Maurice Brierley owner of the super charged Vincent Methamon wrote it. Lots of good pictures etc.
David,Greg,
I have some photos and Phil Irving's notes on the supercharged bikes. Of course, one of them, ST29, was reported to be in Victoria. I wrote about Frank Pratt in an earlier Lightning/Grey Flash review and his partner was the well-known racer, Norm Osborn. Norm is shown here racing STT29 in Australia:
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I believe the supercharger was removed when Norm was racing the bike. Many years ago it was said that the bike was in Victoria in pieces.
Close up photos of the supercharged engine are in the PDFs.
Zollers seemed to be the favorite of MG, so there is some general information available on MG sites:
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David