I remember reading a web page awhile back that some bought small metal
tubes (don't think they were actually vias) and loaded them into a 0.5
mm pencil, they pushed the pencil up against the board clicked it and
the via would pop into the board, a little solder on each side and
presto your done.  You could do something like this, but I have
absolutly no idea what page I saw it on.  :)

Hopefully this helps some, sorry I don't know where I found it,

Aaron

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