Hi, Welcome to JustAnswer.
You order the service manual for your turntable see the link below
or view a general video on the link below
You must remove plater safety lock before you lift the plater. Yours must have one because you stated that it only moves half and inch up. The video does not show how to remove it. Use screw driver to remove it.It is located on the middle of the plater holding shaft and save it as you will have to put it back
The 45 adapter come off easily. Just lift it unless is glued.
is there a way to take a picture of how the adapter is sitting?