Vigier Guitars

I've just sent you a private message.

Hi,
The Neutrik locking jack in my Excalibur Ultra Blues is not work, i.e., it does not lock at all and I can unplug the cable without pushing the red flange effortless.
Is it normal? Does it mean it is broken and I should replace it?
 
Thanks in advance!

<t>Dear Vigier Team,<br/> I recently acquired a Vigier Excalibur Indus form 1999 (according to the serial number). I wanted to ask which significant upgrades have been done to excalibur guitars since then, in particular:<br/> - Vibrato model.<br/> - Frets material.<br/> - Nut material.<br/> Despite ...