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"do not attempt to remove the needle bearings from the Zero pedal bodies. The needle bearings used in Speedplay Zero Pedal Systems are permanently bonded in place and cannot be removed from the pedal without damage to the components. Attempting to remove and replace the needle bearings in Zero pedals may cause damage which could result in severe bodily injury. Additionally, attempting to remove and replace the needle bearings in Zero pedals will void the manufacturer's warranty."
Given they allow you to replace everything else I'm sure there's a good reason they make this statement. As someone who's ripped one of the pedals apart I can tell you it's not fun and if it were to happen in a sprint or bunch you're gonna do more than just damage your pedals.
Needle Bearing successfully replaced. Hard to tell, as it was so buggered, but possibly speedplay loctite them in, which is why they "claim" you can't replace them. I've not bonded the new one, seems pointless as the the torx screw and retaining clip should keep it in place. As long as its kept greased/serviced it will make it much easier to replace next time.
Anyways, now have some butter Zero's to try out. I'm gonna have a go at a pair of those hockey-puckers, I reckon!