Let me start by saying just how much I injoy reading all the post on the ideas of other builders. But I thought it was time for me to try and show a few things I've learned. Before I had a computer to find new ways and Ideas to do things.This subject is on how to get a nice straight tip or stripe on your nose cone. But I found that estes rule can do the job. Even on big cones. The biggest I've done is a 6" but I bet you could draw lines on a 11.5" nose cone if you wanted to.the tape I use is 3m. vynal tape. seams to bend alot better than masking tape. I've posted a bunch of picture on my photo site. They say One picture is worth a 1000 words . That I don't have the time to write. https://photos.yahoo.com/rockets_r_us2