I have a question regarding the dashboard of the AA5-B Traveller, as
my father owns one.

The top of the dashboard says "Do NOT hold" which he blatently
ignores. He argues that it is there to tell you that you mustn't hold
it when getting in.

Now I have said that it means that you musn't hold it at any time, as
when he does, the dashboard under his hand drops by an inch.

Please can you give some advice on this matter