I have a friend who is having a difficult time keeping blanks on the little
blocks that his faceplate screws into. He has tried double-sided tape,
yellow glue, gorilla glue, and most recently, thick hotstuff.

He gets his blanks shaped round, and as soon as he starts to hollow the
insides, they come off. I've seen some of blanks after they've popped
loose. The surface is pretty flat, and it looks like he has applied a
generous filet of glue. We're talking about objects from six to nine inches
in diameter.

The wood is Koa, ranging from near-dripping to dry enough to finish turn on
the first go around. He's not turning at over 1000rpm. I've been using the
same stock, and haven't had a single blank come loose. I use hotstuff
exclusively.

We live in different cities, so I haven't had a chance to observe in-person.
He has been to my shop, and feels he is doing nothing different than what I
do. Any ideas and/or experience on what might be causing this to happen?

Thanks in advance for any responses.