took off my rear wheels today to paint callipers, noticed the big nut in the middle of stub axle, it has notices cut out of it, like a castle effect, usually with these kinds of nut theres a splt pin that goes through a hole to stop nut turning, but these have none , is this normal, are they just tighted up. also there is a bit of movement in discs is this normal.

 

They are just tightened up - to 300 Nm (221 lb-ft), which is pretty tight! No idea about play in the discs, sorry.

 

got new rims on my car yesterday , want to uplaod a large picture, not a small one from my computer, what do i do,