ian16th
Wasn't the J/T upturned chevron replaced with a kind of brass 'wheel' and the Chief Tech's crown likewise ?
I seem to remember some spoof adverts in the RAF News put in by pi$$ed off Chief Techs at the time offering crowns for sale.
Our Crew Chief was a Master Tech and got, I think, a Queen's Commendation for going up into the 'Organ Loft' of a Valiant on the ground at what was then Palisadoes in Jamaica with a fire extinguisher to put out a fire. Brave man!