I'm going waaaay back here but it sounds to me like there
may be an issue with the size of the great apes on the factory
floor.  I recall having many problems on a paper-epoxy
single sided board where handling post assembly and before
test was causing components to be pushed through and so
lifting the land, track, solder joint and everything.  These
were not small pads, either.

One cure for that was simply plating the hole, while not the
most graceful solution the added adhesion vastly reduced the
frequency and severity of damage.  What I can't recall is if
we tried simply switching to FR4.

Yikes, I'm dating myself...  Just guessing someone else in that
decision chain is my age...

-- 
 
      Jeff Seeger                         Applied CAD Knowledge Inc
      Chief Technical Officer                  Tyngsboro, MA  01879
      jseeger "at" appliedcad "dot" com                978 649 9800

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