Warning: again a total lack of originality on my part. The upshot is that apparently I don’t suffer too badly from the not invented here syndrome because I proudly stole reproduced this idea from Tim Layton whom in turn was inspired by Phil Davis and his “Beyond The Zone System” approach. The whole idea is essentially just a hollow tube with two end caps in which you put a single sheet of film, fill ‘er up with developer and agitate in whichever way you fancy. This could be a fancy water bath agitator like in the official BTZS approach, or, as in my case, simply turning the tube over and over like a regular daylight tank, or rolling it on a counter top.