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The blade pivot pin is the pin upon which the blade pivots...
If the blade doesn't swing freely when hanging at 90 degrees from the handle you might try loosening said pivot pin... or rather loosening the fit of the blade to the pin... the gurus on this forum probably have the best ways of doing this but I just grip the blade near the handle with something good and solid and "wiggle" it up and down til the blade DOES swing freely...
However if I received a knife that didn't lock open properly when I hit the button it would get sent back for a replacement.... accepting an automatic knife that isn't is bloody silly.
Miltech is a rather special lubricant... but just what MAKES it special I have not a clue. Others will no doubt be able to advise as to where to obtain it.
If the blade of your knife "sticks" at 90 degrees to the handle I would suggest that little "wriggle" might help. I have had no problems whatsoever returning faulty knives.
AB/SKM.... Knifeshop... AKC.... Frank Beltrame... all are reputable dealers/makers... please use PM's for any further questions regarding buying switchblades from within the UK.