They're not generally considered serviceable parts, if you've got an abundance of time you could try but I'd either replace it or ignore it if it's not important on the turbo.
Useful reply. At least if it goes completely wrong I can console myself that no-one else really bothers.
@snottyotter started
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They're not generally considered serviceable parts, if you've got an abundance of time you could try but I'd either replace it or ignore it if it's not important on the turbo.