I dream of someday owning one of those SD Studios Locator Tubes with all the bells and whistles, but for now I'm playing around with an inexpensive alternative to hang off my armour.
I found one of these at Lowes for $7:
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Here's an online link:
http://www.brightguy.com/Bayco/Bayco+Ni ... rettyPhotoIt is nearly spot on in height and side window location (thanks to PVB for the measurements!). The big drawback is of course that it is an oval instead of a circle, but that isn't impossible to fix. We'll get to that part later.
First off, I wanted to see if my plan for the window graphic would even work:
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Here we have the distance in red printed out and taped down with elctrical tape. This is the first layer only, and it is not yet illuminated.
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So now the second layer is added (this layer is laminated to give it a finished feel). This has the white text and another copy of the red text lined up over the first layer. Together they block out the light except through the numbers and create a slight diffusion. The photo on the right makes it far more blurry than it looks in person, but was the only way I could show that it lights up the red letters only.
So that's where I am so far. I have a plan for changing the overall shape from an oval to a circular tube, as well as find a cap for the bottom and a slotted screw for the side.