The Heil Small Boom comes with a
nylon stem, 2 to 3 inches long,
threaded on one end, that slips
into the desk stand or c-clamp
bracket. The boom is unusable with
Heil mounts if the stem is missing.
I recently bought a used SB-2,
assuming I would get the complete
unit. It came without the stem and
the seller's reply was "sorry."
NOW, I AM LOOKING TO BUY THE "STEM"
ONLY. Maybe you have one in your
junk box. w9owo (at) arrl.net