I'm looking for a great development tank. I already own three models (double- reel Paterson 4 and AP, and a 4-reel no brand one). The problem is they all leak at the lid. I need something super-tight, with a screw lid or something conceived in a way that it would not leak at all as I shake. I saw this Samigon steel tank on B&W. I just can't imagine how is it made. Is that a clip-on lid just like crappy Paterson? Is there any chance it would leak? What would be the mother of all development tanks? I don't mind the price.