I've always wanted to get my hands on one of these gadgets from the hey day of TLR's. I just picked up a mint example at the recent Boston area show and it works very well indeed on my 1937 Automat. This model is set up to work on Rollei's with 75mm f 3.5 lenses. I haven't tried it on my 3.5 E or Rolleimagic. It may not fit. My only complaint is that the three required " C" batteries are quite heavy. Would anyone have a set of original instructions that they can e-mail to me as an attachment? Thanks in advance. Jerry