I'm provarocating now...
What I should be doing is getting on with cleaning the loco of grease and grime ready for glueing the boiler fittings on and painting.... But seemingly I don't want the soldering to end...
Thinking about lighting has made me consider headcodes. With conventional modern locos one could consider these at the very end but not early locos.
Unlike modern engines that had 3 lamp irons along the footplate and one on the smokebox. The GER in the 1870s used lamp hangers. With one at the tope of the smokebox and two either side of the smokebox
Them I re read some articles about the lamp hanging equipment and realised the buffer beam hanger only came into use in 1880 and until then the lamp had been hung off the coupling hook.
Also I had equipped 74 with the left hand lamp hanger on the smokebox which didn't come into use until 1875.... So it was out with the soldering iron again!
Problem solved but the lesson of the day is: do your research first!
But now it really is time to put this loco in a cleaning bath!