I have two (2) weldon endmill sharpeners that a highschool robotic team students dissembled to "see" how they worked. I need to reassemble them. The bearing has been removed from the frame. I had five (5) other spare bearings which they mixed up with the originals. Is there a way to reassemble these things ?

I've heating the outer bearing to about 120 degrees with no joy. I'm not sure how hot I can get them or if this is the correct way to get them back together. Are they lapped to the spindle and only fit the original pair ?

thx for any suggestions

-g