Okay, so for anyone who has had trouble scribing (like me), dreads having to do it on a lot of parts (like me), messes up with the freakin tool no matter if it's a scriber, a dental pick, or an xacto (like me)...go right now and read
blackwolf's "how to" at his site. You will never be sad again. Not only is it easy, it works like a charm and it's incredibly satisfying to do.
Blackie you are a star, dog.
here's the link. go there. be happy.
http://www.spasticforplastic.1hwy.com/custom.html