Whereabouts are you? I have a spare casing with slave cylinder and a spare black clutch master cylinder you could try in case one end is duff. (The m/cyl is the standard type with the built-in reservoir)
I can bring them to Snet if you let me know before Thursday.
Good luck, Paul
Paul
15th year in DD #68 and getting slower by the year
1199, SS800 & 620SSie DD racer