I have a B17 standard on the commuter and it was a joy to sit on from day 1.
I also have a B17 narrow (NOS from 1979) which would not soften.
Remained like new for mile after mile, good for about 30 miles when I would find myself getting restless and shifting about in the saddle a lot; by 40 I was thinking about walking and by 50 I couldn’t. General advice on the forums was ‘stick with it’ so I did, for months.
This continued until it got a real soaking on an Audax. Finished the event and the leather was saturated. I left the leather to dry naturally for a about week in the garage, rubbed in some proof hide and suddenly it’s a superbly comfortable perch.
It got another soaking on Sunday (3 Glens) so I am quite looking forward to my Saturday morning foray into the hinterlands of Fife to see if there is a further improvement.