13. An anchor assembly comprising: an anchor body with an anchor; an anchor head including a U-shaped yoke having two arms extending from the anchor body and a shaft spanning a gap between the two arms of the yoke; a saddle having a transverse bore and a longitudinal bore which intersects the transverse bore; the shaft being received in the transverse bore of the saddle such that a portion of the saddle extends around the shaft between the shaft and the anchor head such that the saddle is secured to the anchor head and can move relative to the anchor head; said saddle having a slot adapted to hold a member; a set that is received in said saddle and can be selectively advanced into the slot; whereby, with a member received in the slot, advancing the set into the slot forces the member against the shaft thereby securing the member to the saddle and fixing the saddle relative to the anchor head.
13. An anchor assembly comprising: an anchor body with an anchor; an anchor head including a U-shaped yoke having two arms extending from the anchor body and a shaft spanning a gap between the two arms of the yoke; a saddle having a transverse bore and a longitudinal bore which intersects the transverse bore; the shaft being received in the transverse bore of the saddle such that a portion of the saddle extends around the shaft between the shaft and the anchor head such that the saddle is secured to the anchor head and can move relative to the anchor head; said saddle having a slot adapted to hold a member; a set that is received in said saddle and can be selectively advanced into the slot; whereby, with a member received in the slot, advancing the set into the slot forces the member against the shaft thereby securing the member to the saddle and fixing the saddle relative to the anchor head. 14. The anchor assembly of claim 13 wherein said shaft comprises a ball shaped element.