If they are a typical grease type seal they should not be that bad to change. A mechanic friend of mine taught me a trick on these you take a screw and cordless and drill it into the metal ring and yank it out, then take a deep socket or hollow pipe the same size as the metal on the seal and tap it in there with a little oil on the rubber to keep it from gouging. Works like a champ on automotive front and cam seals.
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