I have a couple of long 35mm mp film rolls. They wont fit into my daylight loader. I've tried respooling some length so it fits but then I have no reliable way of how much film is left and in most cases I get one odd sized roll at the end of small spool. Am I missing something? I recently got a 16mm cine camera, which accepts up to 30m (100ft) of film while I have 122m rolls. I suppose this is not much of challenge, as I have this flanged daylight spools, but I can fit at most 15m in the developing tank. How can I reliably get 15m spool?