Working on my 1980 XS and found I had leaking carb shaft seals. Ground down the staked ends of the throttle plate screws but could not get the screws out. I tried drilling out the screws on the right carb and fear I didn't get the drill centered in the screw and will never get the threads clean. Does anyone know where I can find throttle shafts and plates for these carbs? I would like to stay with the same setup as I have some money tied up with new needles,carb boots, unipods etc. I feel like beating my head against the wall right now for being so stupid.. uggg what is the commonality of the bs34's between years etc? will I have to find 1980 carbs?