While your e-mail is very helpful to others running old cars with obsolete parts, my reader was referring not to the master cylinder but to a wheel cylinder for the front drum brake of a 1962 Mini. The best answer for that is to fit whole hubs and brakes from a later Mini, and also enjoy the luxury of twin leading shoe drum brakes instead of the leading/trailing shoes of 1962 Mini brake. Another reader, BF, suggests DSN Classics for Mini spare parts. They have a website (www.dsnclassics.co.uk) and are based at Attleborough in Norfolk.