[Bonetools] Door hinge?

[Paul Stokes]

 Hi Etan,
That is the same thing, could be bone or wood it enables the shaft of the bow to turn whilst been held upright.
Regards,
Paul Stokes
    On Thursday, 25 April 2019, 16:11:26 BST, איתן איילון <etana at eretzmuseum.org.il> wrote:  
 
 Why not the upper horizontal handle of a bow-drill?
Etan Ayalon

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From: Bonetools <bonetools-bounces at listserv.niif.hu> on behalf of Paul Stokes <escoffier1951 at yahoo.co.uk>
Sent: Thursday, April 25, 2019 5:28:14 PM
To: Mailing list for archaeologists of the research group for the study of object and waste of bone, antler. ivory and horn.
Subject: Re: [Bonetools] Door hinge? Hi Josje,
They could be the handle/bearing block of a bow drill.
Regards,
Paul Stokes
On Thursday, 25 April 2019, 13:44:00 BST, Josje van Leeuwen <josje89 at gmail.com> wrote:

Dear all, 

This was found in a medieval monastery in Frisia (see attached). It's a bovine metacarpus with a big hole in the centre. Around the hole are concentric friction marks. They cover the proximal side of the bone next to the hole completely. The distal side next to the hole is only partly covered in friction marks. The backside was flattened by cutting, but has no friction marks. Another hole was made in the distal end.
A second one was found in the same dig (but different context), also with a hole in the middle but no friction (see pictures).
Could this be the lower (and perhaps corresponding upper) part of a door hinge? The door could have made the friction marks...
Does anyone know any parallels? Or a different interpretation? 

Many thanks in advance and greetings from the Netherlands,
Josje van Leeuwen
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