Simple Grip Training

[Rory]

So, One of my serious goals this year is to credit card close the #2.5 and get markedly closer to closing the elusive #3 COC.

I am planning on getting more consistent with my grip training, (specifically with the COC) which is the first step.

I think I need more variety though. The problem is all of my grip training has to be simple because I lack the bells and whistles.

I know there are some serious gripsters on this forum. What exercises elicit the greatest response? What will give me the most bang for my buck?

Any ideas for good programming?