Thanks for clearing that up Ed, I got a loupe out and still can't see the join on the tap assembly, it is just visible underneath as a very fine hairline, these old beauties are so well made its a pleasure to look after them.

I haven't taken the cylinder off because there is no damage to the transfer port and the only rubble I found inside were some small bits of leather and a pellet skirt, everything inside looks like new once the dirty oil is cleaned off.

Thanks for your reply....Dave..