Here is the information from Dennis Steele's Dobstuff page on how to go about putting string braces on a strut based scope.
http://www.dobstuff.com/string.htm
I utilised this design on my bracing, but used Dyeema 2mm string in place of the wire. The top section connnection attaches at the point where the stut bolts go into the rim and the bottom attaches to the steel tab on the rim exactly half way between the strut mount - I drilled a hole in the tab to tap in a bolt where the turnbuckle hook attaches.
As promised I will get some actual photos of my solution soon.
The reason for this mod is to stiffen up the structure and prevent collimation drift when the altitude is changed.