Gasket paper (and corn flake packets) - got me out of a jam on Sunday afternoons many times. Local motor factor is old school and sells it off a big roll. Well worth having in a box - you can make lovely ones like @snotty or rougher but serviceable ones by placing the paper over the flange and tapping gently round with the rounded end of a ball pein hammer.
It's an aftermarket pulley so could be slightly smaller diameter, quite a few are apparently (vzi and samba both have several comparisons, seem to suggest around 10% less fan revolution with a majority of the aftermarket pulleys).
Is it really that much smaller? I've never noticed. I think I might have one in the garage, I'll have a rummage.
Good news, always satisfying after major surgery!! That fan belt up a bit loose though, if you haven't already I'd given that a tighten or it will overheat again.....
I agree, but in this case its the drive pulley that is smaller as its the crank pulley that is the aftermarket version. So he driven pulley rotates less, hence less cooling.