I bent the rod too, seemed simpler and more permanent. Mine doesn't start to move off full until about 115 miles, then goes down pretty good. I try to fill up around 200 miles and I take 5-6 gallons depending how I was riding , indicating 1/4 or so. Again it's a trial and error process, just takes time and waiting till the tank is down before pulling the float out. If you're on a roll, just hook a hose on the petcock and let her go into a 5 gallon gas can. If you're trying to calibrate it, I would think I would have more concern on how close to empty I was rather than how full I was. When I changed the float (to a non correct)float on my vintage Willys car, I was more concerned with the amount of fuel between 1/4 tank and none, since the odometer wasn't working.