I've never had a problem with DHL personally.
UPS is somewhat consistent, Fed Ex sucks most of the time.
Usps hasn't let me down yet, their tracking is so-so though.
Like I said, do as little as possible.
83.5mm = .020"
84mm = .040"
84.5mm = .060"
I believe you can use a gasket that is a size larger than what you are boring to also.
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