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I redesigned my box tie tubes to use a magnetic lock, and the results have been spectacular. I first put on the "bracelets" at the top left corner of the photo. These are printed to be a snug fit inside the tubes. One arm is placed in the lower tube and secured using the screw at the bottom of the device. The other arm is pushed into the second tube. The magnetic latch is spring loaded, so the bracelet can be pushed past the latch, but can't be pulled back out again. At the end of the elapsed time, the magnet disengages the latch and I can pull my arm out.  

This is the timer I use for stationary scenes. It's as solid and fool proof as you can get. The maximum time is 15 hours, which is longer than I'd like to be tied up without a break. It controls a standard electrical outlet, so I can plug in a lot of stuff, like the mag lock, a winch, or a vacuum pump.

A story of self-bondage. I had posted this story years ago, but Part 1 was accidently deleted.

Part Two: One Last Time - Part 2 by mrhungry56 on DeviantArt

"Eep! It's n-not what it looks like!"

Willow tying herself up? Now that's just silly.

One night, Callie was home alone getting in some 'special me time' with her ropes, when suddenly she heard her door being unlocked. Thankful that she didn't tie her legs, she dashed to a hiding spot just in time to avoid being seen by none other than her cousin Marie. Her cousin who was supposed to be at an art show, several blocks away. Now Callie is trying to figure out how to get out of this situation because she's dreading Marie seeing her and giving her a(nother) lecture on doing self-bondage while home alone. 

The perspective on this pic was fun to work with, what with conveying the distance between them. It's also always fun to draw the squid sisters, plus I got to include a few references with Callie's outfit
I don't own these characters just the pic

full:www.patreon.com/posts/simple-h…
Please notice that the last step will be difficult to untie if you are not familiar with the method. The first time I accidentally did this method, it took me a long time to untie it. After studying and understanding it, it is very simple.
I haven’t used this method for a year, so I’m a little unfamiliar with it and the remaining rope is too long. It should be shorter to enjoy a tighter feeling.
I don't know why the video has weird proportions, maybe I should look into the reason