Originally Posted by
operator
The plastic cups are fine. Just ignorant home mechanics who don't have access to a torque wrench overtighten and presto-snap-o.
And oh yeah, if it's cracked go get a new one.
yeah, it takes are real mechanic (like yourself) to install a cartridge bottom bracket. i didn't realize how complicated it was. first i put it in the wrong way and stripped out all the left handed threads in the shell. so then, i had to dip the bottom bracket in some elmer's glue and use a sledge hammer to drive it into place, which is how i cracked the plastic cup.