Troughton and Young twin 80w conversion, gear layout

Last October, I saved these 6 Troughton and Young fluorescent fittings, complete with original starters and the Mazda Natural tubes. Out of the 6 fittings, one was missing a lampholder and black end bracket, the remaining lamp holder also being damaged. I was going to keep the remains as spares until a fellow collector came up with what would have been the original twin tube lamp holder arrangement, so immediately got to converting one of the 5 remaining fittings to twin tube, the results being what you see here. To see this fitting working completely untouched and original is a rare sight to see these days. I'd like to say all 5 fittings are still on their original tubes but annoyingly one of them decided to ring off.

Laying out the control gear was admittedly a challenge, as I was trying to imagine what a twin tube layout would be like. Eventually i settled for this layout owing to the fact I wouldn't have to modify any of the circuits, therefore retaining the originality. As expected, extra holes have had to be drilled, hence I carefully measured and marked them all to try and make them look original. In the end i think it turned out just right.