This is it , thx,Had a cymbal stand Expansion Stacker that reminds me of that.
be considered vintage today -it was pre-internet
thought mine was double-jointed tho- Heavy as hale.
Can see the "joint" & teeth looks similar here:
I only have one.i would consider parts trade if I can find more , but I'm pretty sure I just have the one.probably not worth shipping.Here's the original Duplicate X cymbal stacker. They made 6" & 12" models. I still use them , for me they are the most adjustable and simplest to use. I will buy any of these you guys don't want..