Workshops now using 
the Barrett Bass Clamps

David Gage, NYC
Guarneri House, Steven Reiley
The SoundPost, Guilford, Brian Cohen
M & J Healey Violins, UK
James Ham, Victoria B.C.
Geo Heinl & Co, Toronto
Al Jakstad
Lou DeLeon
Cincinniti Bass Cellar
John Michael Smith
Nick Lloyd
Jeff Bollback
ArnoldESnitzer
Metzler Violin Shop
LABassWorks, Lisa Gass
WorldofStrings, JonPeterson
Constantin Popescu
KC Strings, Anton Kuntz    
Robertson & Sons, Albuquerque, NM
Benedict G Puglisi, Australia
Martin Penning, England
Christopher Dungey, Idaho
Rodger Stearns, Ohio
SolVista Violins, CO

....and quite a few more !