A few people have asked me about this recently. As you probably read from this thread, KrF is getting out of it and plans to produce only a few more SFDs. I don't know how they'll share that info if you don't buy their kit, but I'll tell you what I know so we're all on the same page.   BTW, I obtained this info by pulling my own steering apart and doing my own research, so hopefully no one thinks I'm providing anything proprietary here.   The company that manufactures the link is Woodward