am really confused with jobo 4x5 reel"2509n" ..it comes with 2 holders"the manual says After the reel has been loaded,the holders click into place when fully seated" & It's very difficult to insert them in the darkness ..Iv'e tried to develop 6 sheets using the reel without these holders and it seems that sheets are moving and two sheets came with strange black wide line in the middle .
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