All I remember is at the pivot point I could wobble it from all directions and easily see that it was a sloppy fit .
One would assume that both parts would be worn,
Have you got a inline filter as some rubbish my be stuck to the seat, yours being a SR/43 should have over flow pipes, leave the fuel on and see if it is leaking out the tubes .
Allso drain the bowls just to see if any crap has come through.
Try gentle taps with a screwdriver handle around the bowl area as one of the floats could be stuck.