I don't have the link but somebody posted a blog entry where the small pilot holes are carefully drilled through the "blind ends" of suntour derailleurs. A small punch can then be used to drift out the pins. The pins can be re used if not too worn.
Inspired by this piece, I tried it on a shimano exage derailleur and it works a treat. Just search for "suntour derailleur refurbishment" or "suntour thumb shifter refurbishment" and you should find the article.
Just found the piece: http://euphras.blogspot.co.uk/2011/10/h ... shift.html