Microphone stand spare part:
Konig & Meyer 01-82-828-55 is a replacement part for your K&M boom.
The 12mm M6 threaded bolt, with knurled knob, is suited most K&M boom mic stands, where the boom section (the outer section in telescopic varieties) manoeuvres around the swivel joint.
It is compatible with:
210/9, (tall boom stand)
259 (medium boom stand)
211/1 (telescopic boom arm)
and more