I would check with Bruce on that. There are probably plugs ubder the Epoxy.
Lynn E. Hanover
Mike,
After thought..............For the top holes you do not need a full thread, just enough
to hold the plug (and sealant) and invest in a "Bottoming Tap" (designed to produce
threads to the bottom of blind holes) (does not have a taper to make starting easier)
for whatever size plug you find necessary.........If necessary you can cut (grind) the
taper off a cheap tap to produce a bottoming tap.............You probably know all
this but thought I would kick it out there for others of the group.........
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold