A few hints from the archive, since I've never done this myself:
http://www.penturners.org/forum/topic.asp?ARCHIVE=true&TOPIC_ID=7033&SearchTerms=green,wood,dry
http://www.penturners.org/forum/topic.asp?ARCHIVE=true&TOPIC_ID=3998&SearchTerms=green,wood,dry
http://www.penturners.org/forum/topic.asp?ARCHIVE=true&TOPIC_ID=1128&SearchTerms=green,wood,dry
http://www.penturners.org/forum/topic.asp?ARCHIVE=true&TOPIC_ID=2351&SearchTerms=green,wood,dry
http://www.penturners.org/forum/topic.asp?ARCHIVE=true&TOPIC_ID=1257&SearchTerms=green,wood,dry
http://www.penturners.org/forum/topic.asp?ARCHIVE=true&TOPIC_ID=3890&SearchTerms=green,wood,dry
http://www.penturners.org/forum/topic.asp?ARCHIVE=true&TOPIC_ID=536&SearchTerms=green,wood,dry
Hope this helps!