Hello Mr. Tore and All,
I have been working with Simon on the vent valve for MBT 1. Back when I was working on FBT 2, MBT 3, and FBT 4, I discovered the U-570DTPlate28.jpg from the uboatarchive.net was drawn wrong by the Germans where the levers pulled down had the vents closed (WRONG!).
Today Simon noted that the drawing for the vent valve for MBT 1 would never function because the flap valve plate was on the outside of MBT 1. It must be on the inside of MBT 1 to be functional. This was also incorrect in the u-historia.com drawings that I got from them.
I corrected Skizzenbuch and here is the attached corrected drawing...
Regards,
Don_