idahoelkinstrutor no i don't. i started making strings 2 years ago thanks to the help of members on this board.i had problems with serving seperations on my patriot which were winners choice strings that came with the bow.also got another patriot last year stone mountain strings on that same problem.got a pro 40 this year ts1 string on this bow same problem.also looked at many bowtech bows on the rack at the store i bought my from same problem with seperation at the cam.bowtech bows when the string streches leads to over rotation of the cam and puts the string in contact with the axle which causes the seperation you see on so many of the bowtech also increasing the valley puts the string on the axle.just before the string touches the axle there is the end of the cam with a sharp little rise which is were the string will seperate so make sure your not on the rise and string will last as long as they can.these problems happen because the string streches and people don't think they will as the sring streches they slowly loose there valley and move the stop longer putting them on the axle trying to get there valley back.anyway i have not had any problems with my strings on any of my bowtechs since i no whats going on now dyneema strings will strech period.when i made my strings with dyneema 100 inch string total lenght i would - 1 inch or 1/2 for 50 inches under total lenght of finished string. after twisting and streching the string the string would be right on factory specs .most people say to and a half inch for twist thats wrong with dyneema if you do this with dyneema you will be 1 1/2 inches long after streching. this is before you even shoot the bow.with vectron in the string you have to and to your string or you will be short. so all in all 452x is my choice because of what happens with dyneema 452x gives you speed and stays the same lenght when set on the bow.september 18 panhandle elk beware.selway