Please check your inbox John.
This is all academic now gentlemen, as I have had to withdraw the gun from sale.
Having checked it over the chrony again this evening I have found that it is not in a condition to sell. There is also a problem with the cocking lever which seems to be getting worse.
In short it needs servicing.
I will decide what to do with it over the next week or two. The art materials will have to wait.
Sorry to have wasted members' time.