Gamma stringing tensioner nicking

Hi, I have found that on my Gamma Progression ES II+ machine, is nicking or damaging the string when stringing. It seems to me that it happens on the tensioner, once I have tensioned a string. I was wondering if anyone else has had similar problems and knows how to fix it, so it won't nick it anymore.

Thanks!

 

Thanks for the post, but I already know how to put the string through the tensioner, the problem is that the string after it is tensioned gets nicked or damaged.