I am new to APUG, but I too have on of these tanks that I got on Ebay. As noted above, the critical thing is to get the reel spacing correct and then the tank works well. Mine does not leak either, but it is slow to fill and empty so, also as mentioned, use developers that require long times, ie not very active ones or high dilution of active ones like rodinal. As an aside and a bit of history, these tanks have been made since about 1938 give or take. I have seen ads for them in old 1938/1939 photography magazines from that era that our library has in bound format. I also have a Fink & Roselieve adjustable cut film developing tank that my father used to use for 2-1/4 by 3-1/4 cut film. It works well too, although you cannot invert it for agitation like the Nikor tank, but i have to say, it is easier to laod than the Nikor, besides it has a kind of nostalgic feel about. But then so does useing film in general these days.