So if it is an A.M.E. (thanks for the abbreviation
) roller, wouldn’t it still be considered a nearly 50 year old original? Not A 70 y.o.“Donald Cranko original“ but a 50 y.o. “A.M.E. Cranko original”?
Yes, recommending a dipstick is a strange one instead of the plug... too bad it didn’t come with a bright green dipstick 
Now we have to figure out what that extra hole is for, being it’s on two rollers...
Must be where the dipstick hangs