Thumbcuff 21mm
thingiverse
Simple Thumbcuff 21mm inner Diameter, 2mm thick, 8mm long with M3 thread one side (probalby not enough to hold it for long, so a nut in addition is recommended) This is just a toy that you can use to cuff your thumbs together (or someone elses). I am not responsible if you injure yourself in anyway ;)
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