We're developing an expanded line of JMI Wheeley Bars, designed for dobsonians, and it would be very helpful to get a few measurements from the community. We're interested in dobs ranging in size from 8" to 16", from all the major manufacturers (SkyWatcher, Meade, Orion, Apertura, Zhumell, etc). If you choose to participate, we will give you a discount on the line of Wheeley Bars when they become available. Just mention in your order that you supplied measurements for the development of the product, and we'll verify that you sent us photos.
To take the measurements, turn the base of the dobsonian upside-down and lay a tape measurer across the center of the bolt. Then take a photo from a decent distance away (to negate the effects of perspective), and email the photo to me at email@example.com. The higher resolution the image is, the better, which is the reason I'm asking you to email them instead of upload them to CloudyNights, since you're only allowed to upload very small files here.
I will attach and example photo.
We would greatly appreciate your participation!