Adjusting Brake Lever Clamps?

[Sparrow421]

I have a set of shimano altus c10 brakes on my bike. I just got my new shifters in today but i cant figure out how to loosen the clamp! There is no bolt on the clamp like usual.

Here is a link to similiar pair on ebay http://www.ebay.com/itm/Shimano-Altus-C10-Mountain-Bike-Bicycle-Brake-Levers-Set-Black-/371227301287?pt=US_Brake_Levers&hash=item566edf15a7

How do i adjust these so i can install my new shifters?

 

[dabac]

Unhook brake cable from lever, pull lever back and peer inside. There's probably an Allen head screw lurking in there which pulls the clamp tight around the bar.