Recently, Bill uttered:

My Flymo L47 Pilot petrol valve is leaking were it goes into the tank. I've
just called at the mower service shop and he says that the threads have gone
on the tank and it will cost £45.00 for a new tank.
The mower is 9 years old now so cannot justify the cost ....can I seal it up
somehow? maybe with silicon or araldite?

Get some Plumbers PTFE tape - about 50p a roll, wrap about 3 inches around
the thread and tighten with a wrench - if it seals high pressure water
pipes, it'll seal a petrol pipe !!
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It's all on http://support.microsoft.com/ somewhere....
If you can be bothered to look for it....