It would be interesting to know exactly how much Frank Clarke contributed to the design of the Webley Mark 1. His reimbursement contract letter from Webley for his consultancy work says: "...in consideration of the assistance you have rendered us in working our the air pistol having a tip-up barrel, jointed at the muzzle, we hereby agree that during the life of the British patent ......we will pay you the sum of threepence per pistol........

It doesn't sound much, but that is equivalent to about £1.50 per pistol in today's money, so quite a nice earner for him.