I bought a used CPE2 processor with a 2500 tank and whatever reel. From what I read there are two reels, an older one and newer one. How do I tell the difference, and which one that I have? Secondly, are there some sort of additional clips that are suppose to hold the film in? Loading a sheet and observing the placement does not give me alot of faith that the sheet will not come out in rotation. Lastly, I've been reading the online manual. So far no mention of a pre-soak. What's the deal with this and 4x5 as well as the smaller rollfilm formats. Thanks for the help.