Ah, the old technical ranks.
A J/T wore a single inverted chevron
A Cpl/Tech inverted Cpls chevrons
A Snr/Tech inverted Sgts chevrons
A Chf/Tech inverted Sgts Chevrons + Crown.
Master Tech. wore a W.O. Badge.
For 3 years at Locking I looked forward to dumping my apprentice wheel and getting my JT stripe. What happened ? Just before we passed out the stripe was replace with a cut down cloth version of the same wheel we wanted rid of.