Recently had the lot apart at the front end....bearing in the shaft between the stab trim mechanical indicator and the stab trim shaft was worn....I always thought the handle was the 'audible' warning of trim run away? The handles are made loose with several sections so as to 'rattle' when moving?
The 747 had a mechanical 'clicker' to sound when the trim was moving and warn of run away. (would sound a bit like a kids bike with a lolly stick in the wheels).