Spot's right on the money,but I would steer away from using metal tools.
There are plastic or wood sticks available,we call them dibbers here,although I'm not sure what the American name for them would be......

Does this help?

Last edited by jockbolter50; 12/02/2011 8:25 AM. Reason: grammar
1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.