Don't buy if you don't want to scratch your screwdriver. It's very hard to unscrew the one it sold with. I recommend using wrench, cloth and rubber gloves, don't even try without them. Ensure to fit it tight, otherwise it won't spin as good as out of the box.

I've tried to fit these following the instructions but the current end cap on my screwdriver is just too tight. Either that or I'm doing it wrong, but I'm not the only one struggling, judging by the comments on the YouTube video. Not super disappointed because I think this was a freebie or something I added on a whim to make up the shipping threshold, but it's still been a waste of time for me.

After swapping the original top. The fidget never spinned like it use to.

Great quality

The precision screwdriver was already mint, and Now I get to choose the end cap for how I use it!!!! I feel like merch is degrading to the quality you actually get. Well done!