PrimerTimer, to answer your initial question; check at either Home Depot or Lowes for a back support belt. I got mine from there and they were fairly inexpensive. Best of luck!
AS MY WIFE PUTS IT, "SOMETIMES THE BEAR GETS YOU !" I usually do a manual rinseback in cases like this. . I risk it as i dont want to lose all that blood. This morning I got SPRAYED with blood . My wifes hole from yesterdays cannulation let go while cannulating today. It sprayed under very high pressure and coated everyhting including her and me and the chair. I tried putting the needle in the same hole but it just leaked too much around it. Then it blew a second hole from manipulating it. What a mess. I thought she might bleed out it came pouring out so fast. I finally got it controlled and got another needle in too so we could dialyze. I had to put the new access line in backward to make it work but it did . Unfortunatly the pressures are high so I have to run very slow and add extra time. ISNT THIS FUN!!!My hands hurt a lot and doing all this grabbing and pressure makes it worse. My thumbs stay swollen now all the time. It definatly takes its toll. We are all in this together. Its a life style few can understand.