Max, that is probably one of the best solutions I have seen posted, very ingenious using oil to get past pre-chamber - brilliant!
Cams already locked with appropriate sized drill, thanks for the pdf though.
It's more oil than carbon, very soft and lots of it. I could smell burnt oil as soon as rocker cover removed.
The current setting of 4 degrees or so ATDC appears to be incorrect given oil burn and low compression, this changes quite dramatically as above, although not sure the BTDC is right also.