I believe that the S1 had the locking tailwheel, as it was much easier to land on a hard rwy, than the S2,. . .My instructor mentioned this, although you are stretching my memory now DJP. . . being an old fart and all. . .I'd been flying Keith Hatfield's Tigger, ( VH-TIG ) and then an Auster 6 ( VH-ARX ), for quite a lot of hours,. . .followed by a C-180, which had a lot more energy and was 'Interesting' in crosswinds . . .! Having only One runway at Berwick ( 12 / 30 ) gravel,. . .crosswinds were a daily occurrence which had to be mastered or no flying was possible. My old friend David Squirrell, Instructor and Cropduster flyer extraordinaire. . .Taught me all manner of horrible approach and landing exercises in crosswinds, for which I shall be eternally thankful. . . he even sent me solo in his Pawnee,. . .promising to do unspeakable things to me if I bent it. . .R.I.P. David.
The C-180 helped me when I transited to the Pitts. . . .but with the Pitts (as I am sure you know) ,. . .the experience as a tap dancer and Rock Drummer came in handy, especially landing at Moorabbin . . .with it's very Hard runways.
In the early days following my return to the UK in 1983, I found a Pitts S2 owner who allowed me to play with one of his many toys for a couple of years. . ., for just the fuel used . .!. I regret that he died in a Harley Davidson Motorcycle accident where some French Farmer reversed in front of him in central France, but that's another story. As is the one about G-Loc'ing myself with a microlight pilot as a Pax. . . another time for that tale . .