Here’s a little trick I found that is a pretty simple way to check for a bent tail hub. First, remove the set screw from the tail hub itself. Unclip your rear ball link from the tail rod and slide the entire tail hub and slider assembly off the tail output shaft. Rotate the tail grip arms to where they’re touching each other and hold it like that with one hand. With your other hand carefully spin just the actual tail hub itself while holding it like in the picture. Pay special attention to the arms that are touching. If the tail hub has even the slightest bend in it you will see those arms moving in and out as you rotate the tail hub.