I had the issue with the blower resistor, my focus would eat them for fun.

the issue is the actual blower motor, or rather rusty bearings in the motor not the resistor. in fact its part of another issue.

if the pollen filter cover isn't fitted correctly (black plastic cover round the wipers), water leaks into the cabin and into the blower motor, causing rusty bearings in the motor itself

actually, if you look at the pic of your blower motor you can see it's knackered - probably through water ingress, so no amount of greasing it will cure your issue

What happens is, as the blower tries to work, with knackered bearings, it causes a power surge, which then blows the blower motor resistor.

I ended up buying a new blower motor off ebay, once i fitted that the problem was resolved.