Well, I have a Dark Magic, and one thing I hear from people is how they rave about the thumb grinds on it. However, crazy as it seems, I have difficulty doing so. Do you grind on the outer ring (too small of a surface area for me to keep my thumb on) and there’s also an inner ring type deal (keeps on slipping off)
So the queston is, what ring do you use?
And if grinds on this yoyo require fingernails, they are something I do not possess.
To answer your question, the ring designed for grinding is the inner one IMO.
The outer ring is really tight to get into, and it just doesnt happen for me…
Outer lip grind can happen, longer fingger nails helps a lot.
Inner lip is easier, if it slip on you, tilt the yoyo little bit towards yourself, it help me a lot when i first learn it.
Also, based on my experience, grinding on the outer lip give more grind time for some reason.