For those interested, I have seen the new Estes Marking Guide in my LHS. It can be used to mark lines on every tube from BT-5 on up to BT-60. The guide looks to be about 18" long but I could be wrong. It looks like it will be a great addition to the rocket building tools.

It'll even do BT-80. Apogee has a Tim VanMilligan video on how to use it which shows this. I got one in my last Hobbylinc order and have already had occasion to use it several times. It's a universal door jamb which fits lots of tube sizes. Neat tool.

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Bernard Cawley
NAR 89040 L1 - Life Member
SAM 0061
AMA 42160
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I notice that Hobbylinc usually has these at a disount. I plan to order one of these along with the tube cutting guides. I like anything that makes the hobby easier.