Chucky,
I think the catch, use to be metal but they "upgraded it" to plastic.
I have taken the pedal apart and it appears that the bearings are removable after undoing a nut at the outside end of the spindle hidden under the plastic cap.
That said at this price not sure it would be worth it!
I will take some photos and post later once I fix the Power Grips on.
Regards
Jerry