here's an account of one person who've done this: https://news.bme.com/wp-content/uploads/2008/09/pubring/people/A10101/trepan/index.html https://news.bme.com/w

here's an account of one person who've done this: https://news.bme.com/wp-content/uploads/2008/09/pubring/people/A10101/trepan/index.html https://news.bme.com/wp-content/uploads/2008/09/pubring/peop... Not for the faint of heart