Get some grease lube in/on the shaft ASAP, even before the end of winter.
The casing is to be honest a poor quality alloy..akin in a way to white metal !
SO...any wetness/moisture that can get between the steel drive shaft/spindle
and the casing will easily contain microscopic 'bits' of dirt etc or even SALT
which will start corrosion/reaction on the contact surfaces of the shaft & casing.
Prevention is better than cure, and the sooner the better.