Hi William,
I have just seen your second reply which must have come in as I was typing!
Again, thank you for the additional well thought out instructions. I will be going with the faster direct fill method but am grateful for the advice regarding using a cloth as a dust filter during the filling process - this is a very good idea as, of course, the gas movement could introduce unwanted dust into the chamber which would not be good.
As I suspected, this will be like a military operation with careful planning and all the necessary tools available in the right place!
Best wishes,
Steve
