To repair this motor your require 3 things, a C-clip 3mm, you can reuse the old one, but they are small and tend to disappear when remounting or disassembling the motor. I purchased a set of 100 off ebay for just over $4.
3mm Retaining Ring / Snap Ring / Circlip
You need at least the replacement bearing that is broken, but a good idea is to order both the top and bottom bearing for future purposes. I chose to try the more more cheaper bearings on ebay. You can find good quality bearings, but at a price that is some what half the price of purchasing a new motor
The top bearing is a 3 x 7 x3 mm that cost $5,85 for 10
10PCS 683zz 3*7*3 3x7x3mm Metal Shielded Metal Ball Bearings
The bottom bearing is a 3 x 8 x4 mm at the same price.
10PCS 693zz 3*8*4 3x8x4mm Metal Shielded Metal Ball Bearings
Shipping was around a week and a half for both the retaining ring and the bearings.
I simply removed the c-clip at the bottom of the motor, this enables you to take the motor apart.
Using small pliers i sort of loosen the outer shell by kind inserting the pliers between the outer housing and tried to force it up, the metal is pretty thin and weak, it eventually gave way and came out.
Grab a retaining ring and reinsert the bell on the motor, it should snap back on, so wath out your fingers don´t get caught.