I got this idea from a dear friend, that made me realize that something acctually can happen to a dom. And that a tiedup sub has very few possibilities to help, and is also in a very dangerous position her/himself.

A few simple parts, An 8 mm inner diameter rubber fuel tube, 2 doubleholed washers (custommade) and 90 cm of terylene cord

A put togheter like this, note excess of cord at end, it will be needed.

Spreader (or any thing to tie someon to), cuff, padlock and security device

Thread the loop end in the eylet you want to attach someone to.

This took just over 10 minutes to open with one hand.