[TR] TR2/3 carb issue - fiber washers

[Angelo Graham]

Hello List:
  I fitted SU carb kits to my H4 carbs and was very pleased with the 
quality of the SU kits and the components supplied. Managed to get all 
of the leaks stopped and the float/needle issues straightened out. Only 
one problem, I can't manage to get the rear float bowl attachment point 
to stop leaking. The front carb float bowl with the supplied fiber 
washers is fine - no leaks, but the rear is another matter.
I dressed the mating surfaces with a file, doubled up on the fiber 
washers, bu no luck. Still a prominent leak. I have used new fiber 
washers each time, but still no luck.
Any substitute for the fiber washers? Something in a softer, more 
compliant material to affect a better seal against the bowl/carb body? 
What about using something like Permatex on the washers?
Any advice greatly appreciated.
Thanks,
Angelo Graham