New short sections of rails are not a perfect match but allowed the shorter interior rails to be moved to the exterior. 
My teak handrails had been sanded and refinished so many times that they had become quite thin. I explored having new ones made but found that too pricey. I have moved the pristine (but shorter) inside rails to the exterior and added two-loop, 20-inch long purchased rails ahead of them to make up the original outside railing length. The "thin" rails from outside, shortened to suit the interior and cleaned up, are going inside, out of sight.