The old school light bulb burned out on my lathe a long time ago. I ordered these LED's with fingers crossed. So far seem to work. It sits just a smidgen deeper in the covered recess, but the conductor business end fits properly. They come in different colors but I figured green-means-go was a logical choice.
https://www.amazon.ca/s/ref=nb_sb_n...n+LED+Light+Signal+Mini+Indicator+Pilot+Lamp+
https://www.amazon.ca/s/ref=nb_sb_n...n+LED+Light+Signal+Mini+Indicator+Pilot+Lamp+