I am slow to learn of Tandem's switch from a luer lock cartridge to a new proprietary kind. I just learned about it when I called to reorder cartridges today. Are there any pump brands left that use luer lock cartridges and infusion sets? I have a large back up supply of Inset 30's that I can no longer use. Is there a place to donate them? Or is there a magic connector like Medtronics used to have (maybe they still do) to connect the luer lock infusion sets to the new cartridges?