Well I am progressing along on the 4x10 back. I have completed the bellows. I found out that the same rules applies to bellows making as woodworking- measure twice and cut once. I forgot to add extra for the flap. The back is glued up and is waiting to be fitted. The ground glass holder(s) -(I made two as this is where the critical measurements are important )are clamped and drying. I am considering making a bail mechanism to open the back for the holder. I'm hoping someone could provide a little more detail on how this is accomplished. (picture or sketch.) Any thoughts or comments would be appreciated. More pics tonite. Thanks Eric The last 10% of the project takes 90% of the time.