BK-50 Swallow Bug Key Knob

thingiverse

I acquired a vintage BK-50 Swallow Bug Morse key from the 1950s, which required some tender loving care. The original knob and paddle were both missing, so I decided to create my own using 3D printing technology. Based on web photos, I estimated the size and managed to produce replicas that seem quite accurate. The parts were printed in black PLA with a 100% infill setting. A 3mm centre hole was incorporated into each piece, which should be compatible with an attachment screw or stud. To ensure a secure fit, I carefully cut off the original screw's head and it threaded nicely into the new hole.