[quote="photomc"]Sandy, don't you think Don's screen would be an asset with this type of system?
Frankly I have never found such a screen to be necessary when developing in tubes. I just make sure that the back of the film is wet before starting develoment (just pull it in and out of the tube in water) and the anti-halation backing will be removed during fixing or washing.
Just for the record, I remove the film from the tubes and development and fix and wash in trays. If one wanted to do everything with the film in the tubes then the screen might serve some purpose. But for the way I process film the screen just seems an unnecessary complication.