secondary thoughts

ok, i had a thought the other day... most of you that make your own caps
suggest that you pump the air out to reduce the corona... i was wondering if
this would work for a secondary... after building it have a hole where you
can pump all the air out...  i seem to remember someone making a post a
while back about their secondary arching on the inside... i was just
wondering if this could be done to reduce the chances of it arching

TC :)