Yes, Locktite 680 and the primer as well. I think the guy who sold me my machine had the key break and then that allowed the sprocket to rotate on the tapered shaft. Once he discovered that, I think he replaced the key, got out his 20' snipe and tightened the **** out of the castle nut.....which kept it together long enough for him to sell it to me. After about 25-30 hours, it the started making grinding noises and after taking it apart I found lots of damage.