I`m not BBBB but i`d say use grease, why ? cus that what its for and WD40 isn`t grease and is just for freeing shit up and such like so it won`t hang around long on your bearings and after a whatever, let`s say a few days, cus we can, but it`s not gonna be long before those bearings are gonna be running without anything like grease on so not a good fix, where as bearing grease or even vaseline which i used to use on my bikes for bearings will be around slipping "n" a sliding those bearing around for time.
Thanks for taking the time to reply pal. I think that there might be a slight misunderstanding going on. I feel that my bearings (metal shielded) are fine and there is no play so i am not going to be attempting to lubricate the bearings as they are perfectly OK. What I was concerned about was the spindle that the motor sits and revolves on, I believe it was not lubricated from the factory but my concern was having washed it (with good old hot water, fairy washing up liquid and some elbow motion) would possibly leave it susceptible to some rust however having left it to dry thoroughly I am going to just re-assemble it "dry" tomorrow.
Being born 1970 I had all the fun of growing up witht he first wave of skateboards, BMX and roller skates, the rule was that Dad would show us how to maintain our "toys" and after that it was down to us. The amount of bearings that got stripped down to the ball bearings washed in petrol and then re-packed in grease I cannot count, I still have my Dad's imperial sized (about 2.5 Liters) of (and it just soulnds SOOOOO wrong) Man Hole Grease! Once again thanks for responding 'scoops.