Quick Hook Modification

[idmontague]

New to 3D printing and found this useful products to print. I am trying to make the quick hook longer like the commercial metal one I got when I bought the wall control wall part. I have brought the .STL into Fusion 360 to try and modify and make it longer but am running into roadblocks with the understanding the software. Is there an easier way to make the hook longer? I have tried just scaling it in the x-axis but the part that goes into the wall control slot also is scaled up both in slicer and Fusion 360.