I am corresponding with Bert Saunders and following his instructions. I have been collecting and editing everything he writes. I have patched the curtain, adjusted the tension and now I am working on getting the "O" aperture centered. The pin in the H level is part way out but it will not move. When I have completed the repair and I am sure the instructions are both correct and clear, I will ask Bert to read and correct it before posting.
if you are in bert's hands, you are in good hands !