In this thread there is reference to 7/8" size buttons with 2 different NPT sizes required depending on application.
http://www.acmoc.org/bb/showthread.php?22514-Button-Head-fittings-on-Ebay
OO grade grease and be careful of the pressure you apply--the volume type pumps are recommended for that.
Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.
Chapter Thirty
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