Biohazard
Trying to install cooling fan - fitment over the hub was too tight and I needed to sand some crud and paint overspray from the female side (fan hub). The Dremel sanding drum was perfect. Just a hair smaller than the hole I was trying to clean out, it only had to be moved around a tiny bit to clean out the crud without risk of getting the hole out of round.
This plus a drop of machine oil and the fan slips onto the water pump brilliantly.
I plan to fill the coolant and run the engine today.