I just checked the back of my Horizon 202, there isn't a rubber wheel, it's steel. That is the big first roller referred to as above.
After you take your first picture and wind on, any slack will have been taken up, so I'm not 100% sure what is being suggested.
I have had my 202 since early 1994 and I've run quite a fair bit of film through it.
The camera isn't the flashest thing around, it's really more primitive but effective photography.
The wind mechanism is not the strongest, but you wind on carefully.
I use bulk loaded B&W & colour film, so I load to get 18 frames, which is 6 strips of three frames, allowing me to contact print easily.
In quite cold weather, think below -5º C, I don't use the slow shutter speed, I get banding. I assume the lubrication, whatever it is, is thickening up.
I have never seen vertical white (or black) lines on film. What I have seen, is density differences due to uneven rotation on the slow speed setting in very cold weather.
The re-wind lever is hard to hold as it is small and fiddly, but you just do it carefully and it works.
The viewfinder is brilliant, the bubble in the viewfinder is really, really useful.
The accessory filters are great, I find the yellow/green filter supplied, to be very well suited to B&W film and the fitted lens. At least that filter works a treat with FP4+ and/or Neopan 400.
It is a heavy camera, the outer body is all plastic and not of the greatest construction, but it works. The inner rotating section, seems to be a great big blob of metal. This is where the main weight of the camera comes from.
I believe they are quite good value for money, it is a specialist camera in a small market, that they ever were manufactured is amazing. Compared to the Widelux camera, which was it's contemporary when I bought mine, it was one third the price.
I have a couple of images taken with my Horizon 202 in my gallery. Both have emphasised the possibilities available when you actually tilt the camera, up or down.