How to cut the center of a polar grid in Illustrator?

Question

How can I cut out the center of a polar grid in Illustrator?

I created this grid with the outer circle removed:

I'd like to cut out a circle in the center:

So that only the outer radial lines are left, like the units on a clock.

Pathfinder "Minus Front" doesn't won't work since the grid is not a single shape.

(I use Illustrator CS6.)

Answer 1

• Select all and press Cmd + M Mac or Ctrl + M Win to activate the Shape Builder Tool
• Holding Alt click all the path inside the circle