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Richard Blackburn

Hi Dave,

On the detachable head barrels there are 3 grooves on the cyl wall oiling type – each 3/64″ wide and 1/32″ deep as standard from the drawing I looked at. the first is 3″ from the top face of the barrel. The second is 7/8 from the bottom, the third 7/16 from the bottom end of the liner/spigot. It is the 3″ one that intersects the cyl wall oiling hole.