Today's unexpected interest - learning how to apply a libre sensor if the springy thing has gone ping. This wasn't very easy, though it would probably have been better if I'd known which bit had gone ping. The disk came out, so I thought I had to try and rearm the springy bit. Cue much poking of plastic, and even sawing off the top of the applicator so I could free the blue bit. I didn't do too badly, and eventually got it almost together, and was able to press the disk onto the sensor. Unfortunately at that point it all went ping again.
I did however now have the sharp metal inserty bit, so was able to put that into the sensor again, and I then simply manually applied the sensor. Strangely I felt nothing while doing it - obviously pushing it on is slower than the springy bit.
3 hours later and it all appears to be working - that's saved 50 quid or a tedious phone call
Hmm, this also probably means I now know how to replace a knocked off sensor. Dismantle the applicator, retrieve the needle, sterilise it, insert through the hole in the top the right way round (practice with a dead sensor?), manually stick on,
(s'pose I should put a note : I don't necessarily recommend doing this...)