No problem mate. I am only charging what I paid and would have to pay again to replace.
Re petrol. It sounds like the tap to me. On the CSR it is a vacuum tap so only works when the engine is running. Check the pipe from the top of both carbs to the tap (smaller one) If that is damaged or missing then replace. If it is intact I would expect the Diaphram is damaged or the tap is simply gunged up with stale petrol residue. Clean and replace and all should be fine. When on Prime the diaphragm setup is bypassed.
As far as your leaking gaskets are concerned then it is simply a matter of replacing them. Be careful when removing the Aluminium Plugs (4-No) which expose the centre 4 cylinder head nuts. These can corrode in. They have an M6 threaded hole in the middle. A slide hammer is perfect to remove them if stuck.
