thanks for all the help.... yup.. found that out.... the part in need is part of the entire undercarriage assembly... REAL BUMMER! after painstakingly, and oh so carefully, taking this piece of vac tech apart, have just the piece i need, and POW.... have to buy entire assy!! Now that may be fine in some instances; even the diverter valve assy is a separate part when you break it down, but, when this little arm is or has become, a KNOWN ISSUE, why not just sell THAT FRICKN PIECE ALONE! better still, sell a replacement made of a more non-breakable material like carbon fiber or other. i got the assy for 60, new.... not bad.. but it would have been easier to just change the broken piece than the entire assembly which was one heck of a learning experience... for anyone who never changed one of these, be patient, look very closely at how pieces/components are mated to one another, take pictures if needed BEFORE or AS you disasemble, and LOOK CLOSELY before removing screws! if you dont, like in my case, have the svce manual, but are good with your hands and have a good mind for this type of repair work, following the above steps, especially with regard to the microswitch and the brush bar plug, taking your time and looking carefully to how best to get them out AND THEN back into the NEW ASSEMBLY will save you hours of time! HERE IS A BIG HINT THAT I STUMBLED UPON... getting the brush plug OUT from the old assembly can be tricky, unless you take out the little 'wedge' type piece that the wires pass thru... 3-screws hold this piece.... LONG tork screwdriver set will greatly help in many ways, not just this. NOW, putting, or getting that little plug (OH!! INSTALL THE MICROSWITCH LAST OR YOU WILL NOT HAVE ENOUGH 'SLACK' TO DO THINGS) INTO the new assembly can be a nightmare simply because getting it out of the old one is easy is you have the ENTIRE assembly apart! Not so lucky with an entire new assembly. You would have to take the entire new assy apart to get to that 'little' bracket assembly that wires pass thru; you can try to ram it.. but the plug is TOO BIG... the solution is quite simple..
the little black plug COMES APART very easily by prying up the little clip on one of the plug sides then open it, the wires come out and can now be slid right into and through that cavity! mark which side the black or white was on so you can put it back in the same way. once you got the wires through, put the wires with their attached ends back into the plug, snap the cover on! hope that helps... in 2 days, and no manual, i took the entire machine apart and put it all back together perfectly... it is truly a design of genius and insanity!