Thank you Malcolm. I try to write things I wish that I could have read some years ago. Many of these articles have evolved after stints of trying to help people & trying to explain what's going on. Then realising there might be a better way of explaining it.
What I like about putting the articles on HMVF, it is like an EMER, bits can be added or removed in the light of experiences or uncovering fresh information. Unlike a magazine article that gets frozen in time once it is printed & indeed chucked out when someone realises they have too many mags piling up.
There are still mysteries & details I am pursuing, so maybe next year there will be a further version
Curiously I don't actually own a vehicle with the 90A system
