Adding marker lights to a caboose that I already painted.
Used some masking tape to locate the holes and also reduce the chance of scratching the paint.
Drilled/tapped truck bolsters for electrical contacts.
Found it easier and quicker to use liquid food dye for the lenses. I've had this stuff for a long time and I don't think they make it in liquid form, anymore.
I used Tomar's caboose brass markers and I found that some clear LED's works on the electronic component from damaged LED's from the lights4models. I was able to connect two 'other' clear LED's to the electronic components and they didn't blink. Guessing the 'other' LED's used less wattage. I think I was able to use the electronic component from their 'clear', 'red' and 'green' with no problems. The LED's don't shine as brightly, but that's OK.
It also saves me a few bucks to be able to recycle several components where I burned out the LED's.