A fantastic image. Now that you know how it is done, you can hear the Japanese dolls and to understand if it is a welding or a bolt? The hypothesis is that it is a welding in the lower part of the spine, above the bolt. I have the same problem. His hips blocked and tried to flex, breaking his back. I made an incision of 1,5 inches in my back and I found a break under the rear joint. The welding was torn from an inverted U -shaped hip pipe.

I would have liked to replace it with a T -junction made of hydraulic fittings, But the subsequent movements broke the weaker U -shaped U -shaped tube. I tried to use a wiring more often to fix at least the UC junction of the hip tube together and worked a little, But then the pipes started getting out of the tube. I did not use expansion screws. I detached the threads instead of piercing myself in a bad moment.

(I guess there is no good time to pierce). Therefore, I tried to cut the broken vertices of the U -shaped tube to facilitate their use! / arrived for water pipes from 2 inches, Arrived in L and renounted to T instead of the spine instead of the beams of the Sex Doll . This measure adapts well to the tube, but only for the straight parts, then try cutting the curve.