I like the true steel cannulas, but sometimes when I'm inserting them, no matter how much I push them in, the centre of where I'm pinching up my skin (i.e where the cannula goes in) dips into a hollow, so the cannula isn't fully in. I've tried pushing them in when I've stopped pinching the skin as well, but no joy. Does anyone else find this, or have any suggestions as to what to do, apart from trying elsewhere.