My Dad taught me using the interlock decades ago and I just stuck with it. I have tried the overlap a few times and it just isn't comfortable for me.
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Tried the interlock and really liked it a lot - grip felt more secure and hands worked together better BUT the little finger on my right hand got swollen after every round and halfway through the season I had to quit using it cause it hurt too much.
I started out using the interlock, but over time it started out really hurting my right ring finger. My fingers seem to be less stressed during the swing using the overlap/vardon so that's what I'm using currently.