M. Uppercase,
At Heathrow my girlfriend and I were informed that both sticks would not pass security. I forget if we were traveling via a US carrier or BA, however the concern was mostly about the check point. We purchased an oversized case at a travel store and 10 Sunday papers to wrap the sticks in. I heard mixed reports about whether my blunt tipped umbrella would have passed through security or not. But when you love an object that much do you really want to be caught out on a fuzzy rule?
The measurement of the stick was a bit informal in my case. The gentleman that sold me the umbrella was roughly the same height. I tried a couple of other pieces in the shop and he cut the stick to the new size that he was already familiar with. Roughly speaking, the stick sits just slightly higher than where your arm hangs so that you don't have to stretch to touch the ground nor does your arm have to crook to accommodate. It's a wonderfully secure feeling. My other Smith umbrella was bought for me as a gift and is sized all wrong.
Another note about Smith is that they often carry different and varied woods that aren't in their parsimonious catalogue. A trip there is even more rewarding for the new treasures on hand.
As a side note, as i mentioned previously, the Brella Bar has now moved to their uptown location in Manhattan. They even have a blog now. Good people. I've talked to them about cutting umbrellas to size and it may happen.
http://www.brellabar.com/