Oil Inside Distributor

Hey,

I gave my daughter's 95 Civic LX a tune up the other day, and found oil inside the distributor cap. I checked again (after ~1 week), and there's more. I don't think it's the O-ring. Is there a seal on the shaft inside the distributor itself? How hard is it to replace?

Thanks guys.

Your best off replacing the whole distributor when it begins to leak internally.