Alright, this is a little weird. Like I said this is not my GLV, and I never questioned a thing when I got it; she had said it had an adapter on it for 510. When I put an 801 on it I just put an adapter on. Well I just took it apart to the bare bones and it appears that the original 510 connection isn't working, so there was 510/801 adapter with a 801/510 adapter on top of it, then I put ANOTHER 510/801 adapter on it when I was using the 801 attys, lol. It looks a bit cleaner with 2 adapters removed, hehe.