This conversation fascinates me. I have been using MAPP, which works well enough for silver, but have wanted a "proper" torch for some time. The stumbling point is that I work in my attached garage and am not willing to bring acetylene into the picture.

Do I understand that you folks are using the common "cylinder exchange" propane bottles available at gas stations, Home Depot, etc., along with medical oxygen concentrators? If this is the case, I will pursue it, but it seems to me that there must be some innovative plumbing involved. Is there anyone willing to hold my hand and take me through detailed steps necessary to set this all up?