I may be completely off base here, but I thought there was documented evidence of at least 134 changes made by the Sopherim. This is noted in the NWT Reference Bible, as well as other non-JW sites on the internet.
For example:
http://www.oocities.org/hebrew_roots/html/hr-2-1-02.html
http://www.biblestudysite.com/32.htm
http://livingtheway.org/sopherim.html
http://www.faith-once-delivered.org/pages/5-134-emendations.php
The evidence apparently comes from the first page of the Massorah.
I don't personally know a whole lot about this, except that this explains 134 places in the NT.
But, yes, you make a valid point.