I've just discovered the fabulousness of a drum roller. It's an old thing that I got called a SimaRoller, gives a slight up-down motion as it rotates. Says it puts a sinusoidal wave longitudinaly through the tank. This makes good sense to stop bromide drag. I am getting very even development, and am happy to a point... But I fit four pieces of 4X5 film inside they sometimes move and overlap, ruining the development of at least one negative. What other drums are available, at a cheap price, for holding 4X5 in a drum roller?? Are tiny clips available to keep the negs seperated through the trauma of being rolled? Does anyone know the SimaRoller? I also use long Patterson tanks with 120, and 135 format film, and roll away. Usually TMax or FP4 100 iso, It's great because I can do at coolish temperatures and not get too worried about heating water here in cool winter South Australia (and it takes longer) so can relax a bit for say 18 minutes of development at 13degrees centigrade, Ilford LC29 at 1:29. But the Patersons don't fit pieces of 4x5...anyone any ideas on the right tank, or some tiny clips or spacers??