--- In ap-gto@..., "Peter Santangeli" <peter@...> wrote:
Sounds like you had a faulty part. I doubt that you could have twisted
it off otherwise. Now, getting it out is going to be a thorny issue.
One of the first things that come to mind is to use a Dremel tool with
a cut-off wheel attachement to carefully grind a slot across the
exposed end of the 2mm portion extending out of the piece and then use
a flat blade screwdriver to back it out.
Another is to use a brand new set of high quality vise grips so that
the biting edge is new and sharp. 2mm isn't much to grip but it might
The next obvious method is using a bolt extractor, but this will
probably require a drill press and some sort of jig to hold the head
in position. You might be able to use a hand held drill to drill the
hole for the extractor if you use a Dremel and grind a cross centered
on the exposed broken end. The center of the cross will act a a guide
to center the bit for the hole. If it looks like this isn't going to
work, or you are not mechanically inclined with small parts and
precise work, I think taking the head to a machine shop or possibly
shipping it back to AP is in order. Give AP a call on Monday and see
what they say.
In the meantime, I can't see why you can't use the mount.