It turned out that
these holes are accusable from below coming through the rotor housing aluminum.
I just taped a 3/8x24 thread into it and closed it with a 3/8” long set screw.
Did lot have to tough the steel insert.
That was a quick and
dirty fix.
Thanks everyone for
all the good response.
Hopefully no more oily
belly on the airplane.
Richard Sohn
N2071U
http://www.fairpoint.net/~res12/home.html