I designed two types of penis extender. This is according to the average penis size.
After you have done 3d printing you need two M3x10 mm screw and one serum tire (6mm diameter and nearly 250 mm lenght) and a little sponge or something like that.
The screw is designed as a tight fit, not loose video: https://m.youtube.com/watch?v=yCVJF63Hyfg
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