Some but not all of the above, definitely Dennis Hartley, Johnny Ward,Clive Dickinson Mal Reilly, Alan Dickinson, Ronnie Gibbs, Heppy
One not mentioned was Brian Hughes, not the biggest of props, but he never took a backward step and was definitely as hard as nails, God rest his soul.
Also does anyone remember the red haired prop who played for us in the 70's, I think his first name was John ....can't remember his surname though, quiet and unassuming off the field, but put him a Cas shirt on and bang!
Not too many real hard men in the modern game.