- Flatten the cup.
- Fold one end of the flattened opening down to meet the base of the cup so the opening and left side of the cup are alongside each other.
- Hold the bit where they meet to insert it.
- When you insert it, you will hopefully find (as I do) that as soon as the base of the cup is a little way inside it pops open to exactly the right spot when you let go.
It's like an extreme 7-Fold which is how it came about - I settled on a 7-Fold but then just noticed one day that what I was using wasn't really a proper 7-Fold anymore!
My grip isn't all that strong, but I manage this with my Lunette as well despite it being much stiffer than my Mooncup UK.