I saw this on Ebay and thought I would bring it your attention.

http://www.ebay.com/sch/i.html?_trksid=p4712.m570.l1313.TR0.TRC0.H0.XExtremely+rare+medieval+bone+crossbow+mechanism&_nkw=Extremely+rare+medieval+bone+crossbow+mechanism&_sacat=0&_from=R40
I have no reason to think it is not real, but it is to expensive for me. I will not be bidding.
Mac
http://www.ebay.com/sch/i.html?_trksid=p4712.m570.l1313.TR0.TRC0.H0.XExtremely+rare+medieval+bone+crossbow+mechanism&_nkw=Extremely+rare+medieval+bone+crossbow+mechanism&_sacat=0&_from=R40
I have no reason to think it is not real, but it is to expensive for me. I will not be bidding.
Mac