Jon,

I have been using the T/T 8mm x 1.0mm double jam nut for over 15 years, since the 140 FZ days without any trouble. I used to use the T/T aluminum spinner, but have since switch to the plastic cones about 6 years ago.

Once in awhile, you will find one that runs slightly tight, just try it on a different crank & will eventually loosen up. In addition, be careful not to over tighten.

Adrian