Hopeless Avatar hands

OK..here goes. Unity 2019.6.6f1, oculus intergration 12.0. Finally get hands to appear in local avatar (why I have to put in app ID is beyond me as I'm only seeing what unity can do, it seams like Oculus want to spy on everything everybody does!!..typical Facebook). BUT as soon as I attach a sphere or anything to make it a grabber (I assume to the left hand anchor...if I'm wrong please tell me)), then the hands and controllers completely disappear, and I have no idea how to add grabber to hands in the local avatar.
We could do with a video tutorial from scratch with the latest versions just to see if anyone can actually get it working. Watched plenty on Youtube, but some seem to have Avatar with grab prefab, and the latest version doesn't seem to have that.