Any Suggestions on how i can keep the turnbuckle arm from sliding up the cable?
It says not to overtighten. But i have it tight and it still slides..

Anyone having the same problem?

Try trying it in...a brass nock...or worst case scenario...a speed ball.

I had the same problem,the cable attachment kept sliding up and down the cable.Even though the bow shop said it was' nt needed(they installed it)you need to serve where the attachment goes.Without the serving,mine was flopping around like a fish out of water after only about 50 shots.I had Bowman make a new cable for me and he served it where the cable attachment goes.Works great,no movement,tight fit,no problems and this is after at least another 500 shots and still going strong...Bob