Hi Lou, I understand that you are working with what you have but it would be good if you could get the needle valve of the burners to seal before you do much more work. You do not have access to the seating, but you can clean and re-face the cone on the point of the spindle. Do not remove too much metal, but try to get a smooth-faced, regular cone. In the past, I have put the spindle in the chuck of a drill and once running, held a fine-grade sharpening stone to the cone. Be very gentle and check frequently to ensure you only remove any surface damage, and the minimum amount of brass. Once the regulator works, it makes life much simpler as you can then leave the tank pressurised when not in use. Best Regards, Kerophile.