I found out about your adapters on the WatchUSeek forums. I'm not familiar with the GA-1000. What's the distance between lugs on this model? I want to know if this adapter is compatible with a Casio Protrek PRW5100, which has 18mm between lugs (with the wings on). I saw your 1824 adapter. I want to know if there are other adapters for the 18mm lug size. Thanks.