Quote: Having read about such tools on other enlargers I fabricated a substitute out of a length of soft 3/16 clothes line. I ran the head up to the top of the post and simply cut a piece of line long enough to use at the extreme. The focusing knob becomes a pulley with both ends of the line going to my hands. If you keep a little tension on it the line stays on the knob. JP
Lets see 50 cents worth of cloths line vs $80.00 part plus shipping. It has worked quite well for a year or so. I would encourage you to try it before you buy it.