On every TFO (or any other brand) combo that comes out of our shop we cut the pre rigged leader. Out 8 inches from the flyline. We then tie a perfection loop in each section where we made the cut and loop the sections together. This essentially creates a permanent leader butt section with a loop. Now new leaders can be attached with a loop to loop connection.

Never had a problem with hinging unless the diameters and stiffness of the permanent butt section and the new leader are vastly different.