Watch the GoTo Licks: A Half-Whole Diminished "Fordesque" Lick online guitar lesson by Jeff Scheetz from Blues Jam Survival Guide
The half whole diminished scale is one that is not used all the time, but when used sparingly it can really stand out and give you a Robben Ford feel to some licks. Which is always a good thing! You can use this scale over the 1 chord going into the 4 chord - it makes a nice transition. Practice this lick and then "go back" and really get down the complete scale so you can take it to another level.