sorry over the double post,I forgot to sign off.
Hi Bianca,
The builder "Gios" most likely drilled a very small hole in each
tube and after the total braze, he went back and brazed a drop of silver
or brass onto the holes and polished smooth.
A good portion of us do that, the theory is if air can't get in
neither can water and if either of them can't get in than there will be
no rust.
so, don't drill any holes, if you can get some Frame Saver spray it into
the open tubes (seat tube, chain stays, down tube, head tube ) and ride
like the wind.
God Bless,
Anthony Mezzatesta
Mezzatesta Custom Cycles
909 Berkley Manor Dr.
Cranberry Twp, Pa 16066
724 498 4191
http://www.mezzatestacustomcycles.com