I bought the winder and it’s great! Although I had to look no it through my fingers as the tension was so loose the yarn flew off the winder before I wound the whole skein! 
. By running it through my fingers to the loop on the winder it added just that little bit more tension and slowing down how fast I was winding it, the whole 100 grams fit. One more thing. I think, you need to be careful how much tension you add so that the yarn isn’t wound too tight. By the 3 skein I had it down pat and I am so glad I bought one…
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Oooh @Spurs, glad that you got it working and perfectly too. Whoever invented that complicated looking device is a genius 
Do share pics of your success. I am yet to get it completely right.