The easy pop out is an advertising point for this gear, so it doesn't surprise me that the spring keeping it close seems weak in front of the others.
To pop it out, you have to kick your foot back and up. Like that, the rope lays only on the came, the upward movement pushes down the cam and opens it, freeing the rope from the Pantin's body. With a stronger spring, the cam wouldn't open so easily.
Keeping the rope in the Pantin needs a particular movement which doesn't seem natural for me.
To keep the rope in place, it must stay against the back of the aluminum body, at least partially at the top. You can raise your leg with your foot slightly forward the vertical of the next fixed point of the rope ( next ascender, hitch on the saddle ...) or tilt your foot downward.
A little beefier rope helps for this matter.
Just a little cautious training I suppose, but I can't put my mind on it on the job (either for keeping or freeing the rope !).
