Lots of formulas out there for pitch, the cast iron bowl is the
expense there, and even these can be replaced by a variety of
I went to a company specializing in large plumbing parts for utility
companies. When I explained why I wanted the weld-on caps for 8- to
10-inch pipe, he got this smile on his face, and took me over to a
pile in a corner of the warehouse. There were a number of these caps
that couldn’t be sold because they were heavily rusted. Five dollars
each. I bought two. I had to take them to the shop and flame cut an
inch or so off their length, but they have served me well for several
years. They are a bit more shallow than the hemispherical pitch
bowls, but that has caused me no problem. A shop near me had a coil
of wire intended for making springs on agricultural equipment. As it
was high-carbon steel and a quarter of an inch in diameter, I
obtained about three feet of that for chasing tools.
I’m almost out, so will have to see if they have any of that left!