[Bellerophon]

If you know what you are doing it is quite easy to put a hole in the gasket
without destroying it!
The easy way is to mark the position carefully and put in a small hole with
a drill, check that this lines up with the block or head and them use a
small hand tool such as a Dremil with a small grinding wheel and enlarge the
hole until you have a perfect match. If you are not exactly in line it is
possible to pull the hole into line with this method, however, a punch
unless it is very sharp is not the best thing to use.

If you have a problem there is always someone on here who has had the
problem before or knows how to fix it, so all you have to do is ask, and
hopefully you will receive an answer.
My regards,
Bellerophon