These are my oddments, a heavy duty Manfrotto clamp arm at the bottom, then 3 Small Rig arms, 7 clamps and various attachments, I have more than shown.
All that small rig stuff was less than cost of the Matthews stand, I did buy when there were special offers.
I bought the Manfrootto arm at a camera fair, it s rated to hold quite a few Kilos, and it will.
I bought one of these Calumet CK7981 arms arms a few months earlier (same seller), I don't recommend as the 3/8" threads don't fit modern cameras, it was cheap, way less than eBay sold prices.
I also have a clone, a mint Vanguard Multi-Mount 6, it takes normal 1/4" attachments.
Think outside the box . . . . . . . .
Ian