This is an archive of Beeza Bill's BSA A10 which originally was at either Yahoo or Geocities. Around 2004 it was moved to Hailwood.com, and then in June 2019 was moved to cybermotorcycle.com.
A post on britbike.com reads:
"Bill used to ride his bikes hard and fast and swore by his roller conversions. He rode his A10 around Oz a few years ago and didn't have any issues with his conversion. Unfortunately he is no longer here to ask advise."