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The O-ring  part number (that I couldn't remember in my post earlier this
week) is MS28775.  Actually, that is a spec - the part number will be
MS28775-***.  I understand that current military design uses an AS****
spec that supersedes the MS spec.  However, the MS rings should be
readily available.
Dick Alden

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.