If you're talking about the things that spiral-up the roll so that fluids can circulate over the entire length of film whilst still being in a compact cylindrical tank?
Then actually that's easier than you might think.
For most of these, metl or plastic spirals, they have a simple one-way lockig device. It's just a small ball-bearing that grips the film one way and lets it slip the other. The idea is that you feed in a few inches of film, then, grasping both ends of the "bobbin" shaped spool, twist each end of the spool in opposite directions (about 20 degrees) alternately. The ball-bearing system will grip and feed/ grip and feed the whole roll onto itself. COme the moment to remove the roll from the tank. the two ends of the spool can be detatched from the centre.
I hope this is what you meant.
regards,
Jonathan.
jaro said on 10/10/2001 10:52 PM
>I admit the one thing I never really mastered was how to roll film into those little metal spools used to develop it. Its such a pain. So someone else will have to teach that class. >-Jaro
