My first obedience trainer as well as my first field trainer, both wanted me to hold his chin and stroke his head while saying "hold" but that freaked him out and made him hate the dumb bell after just a few gentle, short tries.
I brought it up with my new obedience trainer a couple months ago. First we had to get him to fall back in love with the dumb bell. So, I've been working on that and it did not take long. He is all over me for the dumb bell now. Loves to retrieve it.
He will hold it while walking with me, thinks it's a game. He will not hold it while just sitting still.
The DVD is by Janice Gunn: Janice Gunn's Clicked Hold and Retrieve. I am watching it now and will see how it goes...