+30mm Y-Axis Endstop Extension for Wanhao Duplicator i3 with 8x10 Glass Bed

I had ordered a Borosilocate glass plate but it was warped (seems to be a common issue).
Found a 8x10" glass plate for $2.20 at HomeDepot and it was flat
http://www.homedepot.com/p/8-in-x-10-in-x-125-in-Clear-Glass-90810/202091040
That plate fits right between the bolts on the heat bed but sticks out a bit at the back, so why not print on that new space? ;-)

The corners on the glass plate are very sharp, sand them down with sand paper and clean the plate. To install the glass plate you ne