Ethmostigmus rubripes?

Hi,

On my last trip to Greece, I found a dying specimen of Ethmostigmus rubripes (I think), a giant centipede anyway.
I took it home with me, and let it dry out.

I used to collect butterflies when I was young, and recently I picked up this hobby again, for educative purposes (see if I can get my daughters interested).

I thought I might also preserve the centipede more properly, and see if I could get it mounted nice and straight.
I read about remoistening dried specimen, by putting them in moist conditions for a while, so I tried that, but it doesn't seem to loosen up, it's still not flexible after sitting in a moist jar for more than a week.

I thought I might ask you for other ideas?

thanks in advance,

Dirk