As someone whose too young to remember what locks used to do,
Can anyone elaborate on what they did different to today?
Depends who the lock was Sataris
Some would sit as a floating defender about 10-15 metres behind the line ,and try and shut down any half breaks and would attempt to cut down clean breaks with cover defending tackles
A lot in attack were ball players or hole runners and could just as easily played in the 6 jersey Blokes like Wally Lewis (when he was a lock ),Raper ,Matterson,Langmack,John Ribot (when he was a lock)
Most locks were probably some of the quickest players in the side back in those days over short distances
Some where just hardheads who were just workaholics and tackling machines Vautins , Clydes,Pearces,Lindners
Most locks weren't as big as the props and second rowers until the early 90's when size was more an issue than skill and defensive structures really changed when slide ,up and in ,compressed lines etc etc etc
Back 20-30 years ago having a very good lock meant something ,it was said if you had a good 6,7 and 8 (13 now) you had the makings of a good side
Particularly in the late 80 early to mid ninties the teams than won premierships most premiers had strength in those positions
Hope that helps Sataris