Damn that axle is sweet. Stainless Steel and adjustable.. ohh momma. I want one now..lolBy the time you can see the gap and notice the wheel wobble, you have usually chewed up the entire bearing and possibly damaged the bearing carrier and likely the axle too.
Hopefully only new bearings are necessary.
Don't be hard on your self about it. A used quad of that age was due for this sort of thing.
This is why two of my quads now have "Lonestar Rearend"s
You may want to check a forum vendor for a good deal on these items, but I recommend the brand for their build quality and lifetime warranty. and they are across town from me.
Bearing Carrier with Dual Row Bearings
Adjustable Width Axle.
Tear it down and take a look, then order parts. :crying