Titanium Center Lock Axle

I tried this with my TP Leviathan 3.1 and it screwed up the thread. So use it on your own risk

Another store claimed they work on YYF and C3 ect

One thing to note for sure: You can't take it out once you put it in, there's no hole to unscrew. Your best bet is pliers but that will damage the axle so be careful.

I tried it on my smooth Draupnir OverDrive...then it had Insane Vibe. Unplayble.
I tried it on SF Statement... More Vibe than I had before.
YoYoFriends Peregrine got better than before, feels better too, smoother but didn't turn dead smooth.
I wouldn't say it's worth spending the $15.

Maybe it works on turning point yoyos as described by them and also it IS a turning point product. So I should not give it low rating and gave it 4 because of the benefit of doubt that they were suppose to be for TP yoyos and other specific yoyos.