Try getting a new axle. Mabye from the 7 hits the axle bent and now it has a slight wobble. If that doesn’t work, ask Shawn (onedrop creator) and tell him about it and they might give you a refund.
Anyway, you don’t need to take the axle or O-Ring out now. To take out the axle, take pliers and grip it and twist counter clockwise to get it out. Make sure to put something soft around it so you don’t strip it. Also, i suggest you don’t take the axle out unless you need to replace it or something.
For the O-Ring, just take a pin, and poke underneath it then remove it.
For the sidecaps, use a suction cup, or use duct tape, and remove it.
I don’t mean to necro this post, nor do I mean to jack it, but I do not see a reason to make another topic since there is always one up.
So anyway, I was playing with my DM today and It had its first SERIOUS ding, I already dinged it a few times but it was completely fine before. Now it has a noticeable vibe. I did what you (docrobot) said to do and I also have a slightly bent axle. I just want to know where to buy lock-tite and how to apply it, or if there is a better solution then that.