[Terry, NJ]

A guy who used to be a respected member, named Purdy Swoft, once told us newbies that those tubes had to be one of "Those tubes". I believe the suppler was Renner's Corner. Though I've never dealt with them myself, I've never heard anything negative about them and would not hesitate to buy anything from them. Purdy spoke of trying to make make replacemnt tubes in all sort of ways. One I recall was using brass pen ink refills tubes, sadly, it did, it did not work. So unless you are a competent machinist, I guess it's Renner's.
Terry