Vigier Guitars

I saw an article on The Gear Page about bolt-on neck guitars that use a threaded metal insert to reinforce the necks when the screws are tightened.
http://www.thegearpage.net/board/showthread.php?t=721967
I was wondering if your guitars had ever used these or do now use them.
Would it be hard to do upon request?
Thank you for your time concerning this question.
 

We do not use them because........it is useless. :=)

Thank you for answering my question Patrice.
That's good enough for me.
Merci.
Stephen