John ,
I would like to publicly thank you for sending out samples of your Cuff Lynks.
(It seems you sent out FAR more than you offered to.)
Mine work great!!
I lubed the O-rings a little to help with the break in.
As a sugestion, I think that if the small outer ring had a few ridges, a small space, a few ridges and so forth.
It would be easier to apply the force needed loosen and lighten the cuffs.
Maybe I'm a whimp, But, when it gets up to 2" or even larger I think it would help.
As a note;
If you have a weblink for these cuffs. I'll post a review of them on FaceBook for you, to help reward your generosity.
(300 cleaners so far)