Alisa,
Heat the area you want to pierce until the glass gets soft, use a tool such as Peters Tweezers or Handy Andys to pinch the hot glass together. This creates indentations on either side of the piece where the hole will be. Heat the glass slightly until is is not totally stiff and you do have some heat base in it. Insert the end of your tungsten pick into one of the indentations, use a drilling type motion as you have the tungsten just into the flame. You do not want it to get to hot or create too much tungsten oxide. Push gently and let the heat do the work. You may have to heat the glass again so there is a soft glow heat base in it, and then insert the pick in the opposite side and repeat the process. Again let the heat do the work for you, do not muscle the pick through. If the glass has a little heat in it to begin with, this should be a relatively easy process.
Otter
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