Replaced a burned out incandescent bulb with and LED replacement in a Tomar Industries drumhead ("Abraham Lincoln"); thank goodness for those "Helping Hands" and pencil tip iron. Happy to say that once the LED was installed in the drumhead, and the wiring (bridge rectifier and resistor) assembled, it worked.
Not done, yet, however. I need to reattach the Kodachrome image to the diffuser, then attach them to the drumhead. Props to Duane of Tomar Industries for answering a few questions I had before getting started.
One question he was unable to answer was what size is the LED supplied in his kit. He did check the packaging for the LEDs supplied, and it referenced "1005" but neither of us knew if this is size information. I will say it is an exceptionally small LED--about the size of a large grain of salt.
Glad for a successful project, albeit a small one, since I've yet to come up with a satisfactory process for masking a LIONEL standard vista dome using liquid mask--but I'm still working on this.