Just a note for Shadowcatcher. I followed the link you posted and it appears that as of May 2013, all Lite Cylinder's HAVE BEEN RECALLED. There is a note that not only have they been recalled but no distributer is to even fill one. Might want to Google Lite Cylinder Recall. Words like "field destroyed" "removal of valves" and "public safety" are used.
p.s. New to site. No sure if I should have messaged Shadowcatcher or placed this here or started a new thread or what.