drive shaft ballancing?

I am in the middle of SYE and front DS on Back of my 01 XJ. While puting in the new U-joints one of the weights fell of the drive shaft. How important r they and should I have it reballanced anyway. They want $50.00. I don't want to be cheap. Just don't want to waist money if not important.
TIA

Bring it to Franktown and I'll weld it on for you if we can tell where it fell off. If not leave it off and see if it actually vibrates more.

Stumpalump said:

Bring it to Franktown and I'll weld it on for you if we can tell where it fell off. If not leave it off and see if it actually vibrates more.

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I'm stupid:doh: :twak: :twak: :twak:
I have a welder I'll just tack it on myself. thanks
JD