Rear spindle bushing - hole in rubber ok? replacement?

[onosqv]

Hey guys, I was checking my z32 rear alum spindle for replacement into the car this weekend. I noticed a coupe of the bushings are raggedy - i.e. about 1/5th-1/4th of one of the spindle bushing's rubber is missing. Is this acceptable bushing detioration? Or is this a problem waiting to happen?

If not, is there a method to replace these bushings? I found a link once, but it was a while ago - something about torching/heating the metal part - pounding it out - scrape off the rubber -> then I forgot how you are suppose to put the new ones in.