I just purchased the clamps below, but found they only fit a crossbar around 16mm diameter, making them too small to fit over my Lencarta background stand. Did I miss something?
http://www.amazon.co.uk/gp/product/B005DUXLBC/ref=oh_details_o03_s00_i00
http://www.amazon.co.uk/gp/product/B005DUXLBC/ref=oh_details_o03_s00_i00