Or use Igus bearings like I have done on other large scale motorblock repairs.
http://www.igus.com/wpck/default.aspx?pagenr=3681&C=US&L=en
Drill out the existing plastic and insert the new bearing.
http://www.igus.com/wpck/default.aspx?pagenr=3681&C=US&L=en
Drill out the existing plastic and insert the new bearing.