As I started building the radio set for my L-4, one of the items that I was having a hard time to make, and make it look real were some of the knobs. After looking through my collection of storage boxes I came across the answer. The top of a wire nut was the answer.

Wire nuts come in all sizes and shapes. Just cut the top off of one and glue it to a toothpick. The radios are about finished and ready to be installed.