if its a new string you're trying to put in, wrap more of the string so that you can tighten it until it stops slipping. if not, i dunno man i guess it could be a combination of bad tuner and string about to pop or something else
Do you even know how to string your guitar? That would probably help.
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Didn't Kerry King use MGs at some point?

I think he just endorses them because he likes sacks of money