How can I replace a Dunhill pipe stem?

As it is a joint part, so it may take a year to cure. I know it pains a lot but try to bear the pain, still if it goes worse then go according to the doctor. Else consult with some other doctor.

The copper pipe lines is the better one for hot water lining. Even CPVC pipes are also acceptable but you have to check the max temperature. Contact your local plumber once before changing the pipes, for an better idea.

there is one company may produce this machine, you can send email and ask them www.kescen.com my friend recommend this company

You just don't weld any pipe under 3". There's fittings that will cure just about any problem you got on 1" pipe.

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Now if you had bought 90- $7 Disneyland Zippo lighters with the $600 they would be worth $18,000.00. But you bought a Dunhill lighter which is fun but has little value with age. At least at this age. Perhaps it is worth $100? In 100 years it will be worth $300. In 100 years - 1 Disneyland 1975 Zippo ...