I thought the 250 was one of the ones that had adj. at the limb bolts? Does it not? If you post pics I can prob. help you. I had a customer that had scads of them. Matter of fact he had so many that he kept sending back to Onieda for tune ups and cable changes under warranty that they GAVE him a limited edition bow. If I am not mistaken he had over 40 Onieda's. If I can't figure it out, I can ask him. He can tell me. He used my shop to work on his stuff and taught me some about them. I will give it a shot if you want. You can post here or send to
www.dryridge2@netzero.net if you wish for me to give it a shot. Be sure to post a shot of the inboard limb where it attaches to the riser and the area where the cable ends attach to either the cam or the riser. (diff. on diff models). Like I said no promises, but we can give it a shot!