I remember at the time he commented on how carefully the winder had to be matched to the camera in order to get it to wind in a single pass of the trigger.
with all due respect to what experts are saying.......SCNOO is designed and constructed in the way that, with exception of the first wind after closing the camera, the full wind requires ONE pass only. Being lucky still to have SCNOO from Jim I tested it on 30 cameras, models from Standard till IIIb, SNs from 42xxx (IIIa sync ugraded in mid fifties) till 357xxx (postwar IIIb). I am sure that majority of these bodies did not have SCNOOO attached before. On all of them a single pass is enough for the full wind.
So there is nothing like matching SCNOO to the camera, SCNOO must work properly on every camera which supports it (see restriction in part 1 of my instruction).
There are 2 main reasons why more than one pass is needed:
1. trigger is not travelling full rails - it must be moved from one end to another - and this may have again 2 reasons:
1.a. tape/ribbon to short
1.b. leaf spring is too much pre-tensioned
2. spring clutch between drum and shaft has malfunction - possible reasons described in my document
Cases described in 1a and 1b can always be repaired, broken spring clutch not always, it depends of the nature of malfunction. In case of Jim's SCNOO it was only hook which was broken. Recreating new hook shorten the spring by 5mm only, the spring has still enough grip on the shaft to turn it. But if it is broken in the middle than it will not be able to provide 100% grip between the drum and shaft, it will slide over the shaft. Similarly if the spring or shaft are heavily used and their surfaces are "polished" - there will be not enough grip. Possibly such spring could be done but it is not strightforward (how hard the material for the spring shall be, it's diameter...)
My comments relate to SCNOO only. I do not know Leicavit nor MOOLY, it could very well be that they need to be matched. For sure the electrical motor for Reporter was matched to body.
If someone of LF members based in EU (import tax implications) has SCNOO which requires more than one pull I can offer free of charge inspection and repair, if possible. Asking only for postage.