Thanks! I understood more clearly now how it is built. I was not fully aware of where the split was. It was a must for me to get a hold of the backpart. And I realised that was onkly going to happen if I deflated also the neighboring chamber. When both chambers were fully deflated it was quite easy to get hold of the backpart and the valve came out just like that. Thanks again, very helpful with tips and link to videos.
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