How do you tell authentic from after market.  Ebay has a number of "top-rated" sellers advertising Titleist OEM sure fit adapters but i got one with a serial number and it looks slightly different where the female threads insert into the housing.  Also, my adapter from Titleist had a slight indented dot between the A and the C...............so does the one i got from ebay but it is towards the top where the Titleist is toward the bottom.............just really want to know if there is an easy way to tell.