Round the post

These are posts from non-locking tuners (machine heads to some of us). Note the number of string turns.

These are posts from non-locking tuners. There are obviously more turns seen here.

I recently came across a guitar sporting locking tuners but the owner wrapped rounds of string at the posts & when queried, the answer was, "To promote grip."

FYI, if the tuners are of the locking variety, there is already a mechanism in there to grip/clamp the strings, to make them stay put so there will be no slippage when you tune your instruments. The non-locking version requires more turns round the posts to emulate this grip. If you insist on doing rounds of strings there for the locking version, to put it simply, you don't know what you are doing. So how much string length is good for the locking version? My simple answer to this will be: Enough to address any sharp/ flat responses during tuning. From my personal experience, one round is enough. :-)