Thanks for your advice. I will buy the Linhof book. The shutter was barely saved. The seller, forgot how it worked and I did not know. I stopped him from any abuse and got away clean. I just followed your advice and B&T work fine. The speeds vary, but 1 second is fast. Perhaps it needs some exercise. The seller claimed this rig was last used in the 80's. Aperture works fine. The elements are clean and unscratched. I assume one removes the rear element for the double effect...I will bother Bob Salomon when I have some real problems. Like parts!