I'm in the search for a dealer that sells 50 Series QA1 7" and 9" replacement parts, mainly just the replacement rods (shafts). The only 2 dealers I have found are:

My main question is, does anyone know why replacement parts are so redily available, and QA1 replacement rods (shafts) are not? And does anyone know of any other business that sell just the rods (shafts)? Thanks in advance!