Re: Lost stem that screws into the neck!!!!
Look up Speedy Metals on Ebay or online and call them up. They sell plain old stainless steel pipes, cut to your dimensions. Youd have to measure your pipe and tell them you need a threaded piece. They are just a scrap metal wholesaler, so sometimes they have what you need and sometimes they dont (they have a huge selection though).
This is probably one of the cheaper options.