Actually, all One Drops are ‘not’ like that.
A One Drop that can’t be opened is about as rare as a tap dancing chicken wearing bib over-alls and break dancing to church music.
Either your yoyo finish is simply too slick to get a good grip or your grip isnt good enough to get the yoyo apart.
You need to give yourself a gorilla grip!
This is what you need to do> get two 6 inch pieces of clear 2 inch packaging tape. Or duct take if you don’t have any clear tape 2 inches wide.
…get one piece of the tape and stick about 1/4 wide to the edge of a table. Now roll the tape edge nearest to you overhand into a small tube; so that it looks like a straw.
Do the same thing with the 2nd piece.
Now stick one piece of the ‘rolled tape’ around the edge of the yoyo. Press the tape down as you stick it to the yoyo.
After you have both halves taped; get a good grip around the yoyo.
The tape will stick very well to the yoyo halves and your hands. The tighter you grip, you will have a very obvious increase in gripping power.
At that point you will have the awesomeness of the Gorilla Grip…
PS… in a reality based World; you should never have to resort to the Gorilla grip to get a One Drop yoyo apart.
The design of the side effects yoyos pretty much eliminates taking drastic measures.