This might be a stupid question but why is it that most pilot bearings (including the one in the clutch kit I bought) come with the large metal "shell" or whatever it is that the bearing is in, even though it's not part of the bearing-but a few don't? I thought standard procedure was to replace the whole thing, but watched a video earlier where they just pulled the bearing itself and replaced it. Also asking this because I'm using a slide hammer, the bearing itself popped right out but the shell won't budge. I had to order a puller to get it out.
