I used to work at a showerdoor shop. The way we used to cut glass/mirrors was to make the score with the glass cutter, then tap the edge of the glass at the score with the other end of the the cutter to start the break(our cutters had a bulb at the end), then move the score to the edge of the table and push down to continue the break. Another way is to put a dowel under the score and pretty much to the same think. It is pretty easy, but it does take some practice to get it right everytime. I hope this helps.
Nate
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