Self-bondage using a vacuum bed

I want opinions, okay? I’ve always wanted to experience a vacuum bed but my mistress doesn’t like them and she forbids me from seeing any other women. So I’m wanting to experience it by myself. Here is my plan: buy two timed outlet extension cords online. Buy a mouth gag with a breathing tube. Then get the actual vac bed. Hook up the vac bed to a vacuum cleaner, plug up the vacuum cleaner into both of the timed electric extension cords and set the timers for 30 minutes. Attach my mouth gag with breathing tube and turn on the vacuum and hop in quickly. I figured that if both of the timers fail (a one-in-a-billion chance) then the vacuum would tear apart after about 3 hours or my breaker will flip, shutting off the power. My breathing tube can’t slip whatsoever because it is attached to my mouth. Do you think this would be safe? If not, what could make it safer?

Bad idea. Once you are in there, you're completely immobilized. Sounds like lots of fun but if something goes wrong, you're screwed. Timer jams? You're stuck. Setup catches fire? Possible - vacuum cleaners use quite a bit of current and most timers are not designed to take a heavy motor load. Don't count on nothing happening to your breathing tube. If something does happen, you're screwed. The problem is the "single point of failure" scenario. Any one little thing can degenerate rather quickly into a dangerous, if not deadly situation. Your mistress has good cause not to like them - especially in an SB situation. If you absolutely insist, do several dry runs *not in the bed* and make sure nothing gets hot or otherwise fails. Don't let enthusiasm or hormones override common sense. Plan ahead, test, re-test, and re-test again. If there's a flaw in your plan, it's better it comes out before you commit yourself than when you're stuck and unable to intervene. Jenny.