Got the other blades and spindles off. Bert you were right the nonbuggared up ones have the hole and shear pin. The buggerd one has the hole rusted over and i didn't see it and the wrong blade without the holes. Thanks for the info.
Those blades are not cheap
The proper ones are very thin but funny enough seem to outlast blades 3 times as thick so must be made from a very high grade steel $$$$ .
It would be prudent to order them now because they might take a while to turn up
I got a lot off ebay from a shop who was selling down his stock .
From my friendly Husqvarna dealer it was always 2 to 4 months for delivery so I keep at least one set of each blades but in 10 years the only blade I have replaced was from hitting a dog bone .
OTOH I have replaced a lot of shear pins as of course this is OZ the gum tree capital of the world so lots of dropped branches