The process is quite simple:
- * cut off the required number of 11mm lengths of K&S 7/32" square brass tube (clean all sides of the brass section on fine abrasive before cutting it up)
* clean up ends, inside and out; scribe a line across, 3mm from one end using a piece of brass or other material as a guide for consistency
* affix AM Models NSW Railways etched brass loco numbers (I used spots of cyanoacrylate, applied with a toothpick, but it would be preferable to sweat them on, although the two-digit numbers deterred me from trying this)
* spray all sides of the square section with self-etch black
* with fine emery board, jeweller's file or similar, remove the paint from the front of the numbers
* similarly, work along each edge on the front of the boxes to provide a suggestion of the brass surrounds to the lever identification plates
* the sections will now push onto the levers in a tight sliding fit.