I put together a little video that shows how I address loose props. The Parrot Rolling Spider props are expensive and unfortunatly they are quite vulnerable to becoming loose. Not sure what the shaft diameter is on a parrot drone but nonetheless they fly great but after taking them on and off a few times they start to loosen up. This is how I fix em.
Nice. Very elaborated.
'Cause I don’t have that special equipment (gel and uv light) I just use a tiny bit of ca glue.
Find out that sometime it’s better to have a little loose prop. So in a crash the prop falls off instead of breaking. But not too loose that it flys off during flight - it’s a thin line between this two possibilities.