From your text it seems to me that the problem is probably with your
Jump Ringer technique rather than with your flex shaft. I suggest
you do the following:
Insert a 3" long wooden dowel into your coils and cut them on the
dowels.(Use bamboo skewers and round toothpicks for really small
diameters.) The dowels need not be a tight fit but will support the
Wind your coils no longer than 3" so that there is a space on both
ends of your “V” groove.
If you haven’t lubricated your flex shaft in several months, it
would be a good idea to do it now using Foredom’s grease. While
you’re at it, check the set screw at the motor end of the shaft for
Ray Grossman Inc.
Manufacturers of Jump Ringer