Andrew-- Thanks! I only *wish* I was doing 11x14 plates, now--that's just the spec for the camera. I need to correct the text, but The Wollensak Vesta was sold under many different names--including as my Seneca Series A.
Thanks Scott. I feel like I'm literally learning something new every time I shoot plates. I just discovered that the "silver" wire I bought for my holder isn't real silver and has been corroding and giving me all sorts of artifacts.