Something to consider - I use one pretty regularly as my finger/thumb get chewed and calloused up quite a bit with winding watches all day long, 7 days a week...
http://www.esslinger.com/bergeoncrownwinders.aspx
This is good for small crowns that are difficult to grip, and also the clover leaf style, which I hate...
You just need to buy the correct size for the crown you are using it on, and of course there are other cheaper brands than Bergeon.
Cheers, Al
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