ORIGINAL: zetor
What I don't understand is why doesn't someone step up and make a simple spinner that doesn't need grinding out for the wider props.
Simple... If they made a spinner to fit each brand (and size) of prop, they would have to make about 100 molds for each spinner. and of that hundred or so types, how many do you think your LHS would carry? And in what Color?
The simplest way around this is to make each spinner for the smallest (reasonable) size prop.
If you need it bigger, you can enlarge it, but if it's too big, you can't make it smaller.