Triple Backdrop Chain Stop

My triple backdrop holder wants to roll down, and I am leery of setting a ton of friction to stop it. Instead, I have a simple part that the chains hook onto to stop the paper dropping on its own.

(Uploaded version should have fixed the two screws being to close together.)

Simply grab a set of 1/4"-20 hardware (2x screw/bolt >1.5", 4x washer, 2x nut) and slip over your Varipole! I recommend resting the top against something sturdy, like the varipole's handle.

Design fitted for these components:
http://www.bhphotovideo.com/c/product/903538-REG/Impact_Deluxe_Varipole_Support_System.html