Okay, this is a simple question, which doesn't mean it will have a simple answer. I have a Yashikor 80mm f/3.5 lens in a Copal MXV shutter, which I removed from my Yashica 635 TLR camera when the aperture coupling on the camera body broke. The lens aperture works fine, and the shutter fires correctly at all speeds. I've been using it on my Cambo 4x5 with a 6x7cm roll film back. At macro ranges it more than covers the 6x7cm image, which makes sense since it was designed for a 6x6cm camera. However, the shutter has no cable release socket and no preview lever, as these things where achieved in other ways when the lens was installed on the TLR. This makes it a bit of a pain to use on the view camera. I would like to install a cable release socket so I could use the B setting for focusing. Any suggestions on how to modify a shutter like this? I can supply pictures if anybody needs them. Thanks in advance! PS - I should add that my attachment to this lens is somewhat sentimental (the 635 was my Mom's camera). I know I could just buy some other lens that already has a cable release socket, but I want to use this one.