which one?

[Nidramag]

The enemy parts list says no, the item database says yes, can purplenum characters find hildeblues heads?

[KojiroAK]

Till yet i recognized if there is a dubiety, then the Drop Charts are right.
(And from there, yes it's possible)

Actually I'm not that sure, but i think as i found my Hildeblue's Head, i found it with a Purpelenum.
(But is already long time ago)

[Drakorn]

Here are a few drop charts i can show you

1. Normal Drop Chart - Normal (http://faqs.ign.com/articles/453/453744p1.html)
2. Hard Drop Chart - Hard (http://faqs.ign.com//articles/497/497901p1.html)
3. Very Hard Drop Chart - Very hard (http://faqs.ign.com//articles/401/401972p1.html)
4. Ultimate Drop Chart - Ultimate (http://faqs.ign.com//articles/393/393635p1.html)

[Kevino]

double thread?

[Drakorn]

Yes its double thread