aarthi,
You can't change the thickness of the pointer on the CWKnob control, but you can change the style of the pointer. For example:
CWKnob1.Pointers.Item(1).Style = cwPointer3D
sets the pointer to the 3D style, which is a little thicker than the cwPointerNormal.
If you migrate to Measurement Studio 7.0 and use the .NET controls you have more control over things like pointer thickness.
I hope that helps.
Matt P
NI