Question time # 85 resolved.

A hole in one there 12.7mm
Dacka, dacka dacka.

I like that ; although 0.5 inch was the expected response.

We are looking down the bore of the Rob Broek North American P51D-20NT Mustang ZK-SAS.

Thanks to all those that gave it a shot - now if I could just find a 12.7mm chocolate fish ??