IM JUST GUESSING YOU SHOULD HARD CHROME PLATE THE ROD HOLE. THEN MACHINE IT AS CLOSE TO STOCK AS POSSIBLE THEN IF YOU HAVE TO HARD CHROME PLATE THE WRIST PIN. REMEMBER THAT THE ACTUAL TEMP OF THE WRIST PIN WHEN ITS IN BATTLE IS PROBABLY FAR GREATER THAN 210 DEGREES.
IM NOT A MACHINEST SO THIS IS JUST MY 2 cents
BONDO