the problem with using a j28 for me is that the tips are so expensive. But you do see the tips occasionally on ebay. Granted, there are a lot of clones so finding every one is tricky. Like I said in one of my previous posts, once you get reasonably good, you only need one tip for most work, two will definitely do it. Sometimes I'm working and think I should change to a smaller tip, but it's not something I would do if the torch was already lit