Himself got to an advanced stage with carriage 20 - having given the body a coat of primer - when he spotted something that wasn't quite right.
This is one of the bowsiders which still bears the evidence some of the more practical overhauls they've had to keep them going after 140 years or more.
In this case it's the chequer plate which covers the step on the balconies, while others have been rebuilt with wood in more recent years.
It was quite a simple job - for him at least - to cut and bend some etched brass sheet to shape and get it fitted.
As always, it's the little details...