Fingers crossed you can get the other shell.
Like i said things can be done with lots of time and money but knowing when to walk away is a good thing.
Its a shame i know and you will feel cut up about it but when you get folks who repaired utter pieces of plop saying don't then you know things are not good.
As for the gas DO NOT use those disposable bottles. They are rubbish and will not last as long as you think. Try Adam Gas and enquire about their 5% Argon CO2 mix bottles. You will need a regulator but ultimately worth it.
https://www.facebook...384687888269789