Nikon's SC-29 TTL sync cord, when mounted to a flash bracket tends to twist or rotate on the mounting screw. Stroboframe offers a solution with a specific Anti-Twist Plate. It acts as an interface between the SC-29 and the bracket, pin-registers to the bracket and conforms to cord's mount. This locks the SC-29 to the bracket to prevent twisting.
The Stroboframe Flash Anti-Twist Plate for Nikon SC-17 Cord was MFR # 300- C17, which has been discontinued and is no longer available. The 300-C29 was designed specifically for the Nikon SC-29 Off-Shoe Flash Cable. I cannot guarantee it will work with the Nikon SC-17 Off-Shoe Cable (which has also been discontinued and is no longer available). If you still own the SC-17 cable, I can only recommend to try purchasing the Stroboframe Flash Anti-Twist Plate for Nikon SC-29 Cord and trying it with your off-shoe cable. If it does not work, you would have 30 days from the date of purchase to return the cable for an exchange and/or refund.