Nick speaking,
I know I am a bit late to the party with this, but here is a magnetising tutorial I did for my recent Harpy/Hive Crone build. In this video I show you how to magnetise the two heads, all the arms, the two wings and the four tenticlids. I hope you find it useful...
How to Magnetise a Tyranid Harpy/Hive Crone
by IDICBeer | Feb 3, 2015