Engine preps for micro LED's.
I like lighted marker/head lights on the engine and tender plus lighting the cab.
Using a #45 drill bit works to drill out the marker (classification) lights and head light.
On the GN H-7 pacific, I used a hand drill on the marker lights but a small hobby drill press for the headlight. A pop cycle stick was put between the headlight and smoke box cover to keep the fragile headlight mount from bending.
On the GN S-2 northern, I started using a hand drill on the marker lights but the brass seemed to have a harder tensile than on the H-7 so, they were removed and drilled out. Interesting that the tender had some marker lights just behind the coal (oil) bunker. The mounts were way too fragile so the markers were removed and drilled out on the drill press. A hole was drilled on each side of the tender, just behind the marker lights, to route the led wires.
An extra hole was drilled in the smoke box cover to route the led wires.
I've started putting the drill press on the floor over a large blue rug as, when it's on the work bench, sometimes those small items 'fly loose' and they are hard to find on the floor and sometimes go on the shelves under the bench. The large blue carpet makes location a lot easier.
On the tender, I had to use resistance soldering to remove/add the marker lights due to the large surface area.
Lucked out on the tender back up light as the #45 drill bit fit just inside the casing. I backed off several times as to not overheat it and cause the solder to melt.
The injector valve (I think that's what it is!) came off under the cab and had to be re-soldered.
Kind of mass production line: doing all the marker/head lights on several engines at once.
GN H-7 smoke box front.