hobbed bolt bad

my hobbed bolt is not cut even.
if i rotate it by hand i can clearly see its bad.
i can feel it same when i manually extrude by rotating gear. every 360deg turn it will go loose.
i would get it tight at its looses point but then it would get really tight.

i get filament grinding because of that.
can u guys sell me another one thats cut even ?
i cant find any online, they all seem to be too long. in fact i already bought one silver, it has finer threads (not good) and is too long.


thanks

 

Ah never mind. Found another one for $10. Will wait and see if its just as bad as the others.