Printrbot simple belt X-Axis

Replacement for the x-axis fishing line with a T2.5 belt and 608 bearing.

My X-Axis line isn't proper installed so from time to time they jumped out and i have to fix it.
Insted to fix this problem i saw on thingiverse that another user replaced the x-axis with a belt.[ http://www.thingiverse.com/thing:194686 ]
unfortunately i hadn't such small bearing at home, so my journey starts...