Has anyone ever inserted the cannula part, unclipped the tubing that is attached and then attach tubing from the old insertion? I ask because we seem to waste so much insulin. I thought that as long as there was good insulin in the cartridge and the tubing was already primed that I could just insert a new cannula, connect the tubing from old insertion, fill cannula and be good to go. We had one of those nights last night. High levels, blouses were not working, and of course it was 2 am. My sleep deprived brain is not working at its best right now. He is fine by the way and levels are good. Thanks for any suggestions.