In real life it looks someone was mucking about disassembling the lens and my theory may not work. where infinity focus and the setscrew detents lined up with the proper position of the RF accentuating tab (focus was also verified at closer range both on the RF and groundglass) so it should equal the factory collimation. In theory as there was only one possible position: i.e. On my Super Ikomat the second cell is held by its own ring so it does not move when the front cell is removed. Many thanks for your advice and encouragement.Д«ulb is not working - and I'm quite familiar with the operation of pre-war Compurs (having learned photography on them and currently having about a dozen) and am well supplied with cable releases (including those neat short pre-war Zeiss ones meant for folders)being also into LF. If there are sharpness problems after my rough and ready ?fix? then Mike Elek?s collimator would be the next step. I think at this stage a roll of film is in order. Obviously with the detent position requirements and the lack of a way to hold the shutter open (that didn?t require one of my hands) I couldn?t fine focus the cell. Inside I tried at a closer target same results. In any event the correct position of the cell is somewhat pre-determined by the location of the detents struck into the rim for the setscrews (which must line up with the RF arm that actually turn the lens helical).ДЄssuming I got lucky and started the cell thread at the right point, I set the RF at the infinity position went outside with a piece of grounds glass and kept the shutter open by manipulating the cocking arm at the one second setting (remember no T or B) and checked infinity focus at a distant target until it seemed OK and the detents lined up correctly. The collimation ? well we shall see? It made no sense to note the position of the cell as the camera had obviously been opened. Well Pablo, the removal and cleaning of the front cell went smoothly.

Zeiss lens repair