A safe spreadeagle technique

[ArtificialAesthetics]

Those buckle thingies are called ladder lock buckles.
Wish Id known that BEFORE ordering expensive polywebbing harnesses, but meh

Was overworked and too lazy to engineer, so I guess it's fine.

https://sendvid.com/b9ga7wie

[TicleMeEndless]

This video looks like an rocket cockpit camera)))
10...9...8...7...6...5...4...3...2...1...ignition. Liftoff.

https://youtu.be/fr_hXLDLc38?t=18

[Shannon SteelSlave]

LOL. At least the subject is buckled in.

[TNTBound]

i always use chains and leather cuffs with a padlock to connect the cuff to the chain. then the keys are attached by string to the chain within reach. the keys are then locked in a kitchen safe for a set time. works pretty good for me. no escape until that timer clicks down.

[Sergio]

i always use chains and leather cuffs with a padlock to connect the cuff to the chain.

I do much the same but with the chain already attached to the cuff and initially enough excess chain to let my left hand reach the right to fasten the cuff and vice-versa. Then with an open padlock in each hand I gather the slack in each chain into a loop until I'm sufficiently stretched, and lock two links together. The advantage is that the final step is done comfortably within my reach rather than having to wrestle to pull the chain tight enough while bending to reach the D-link on the cuff.