[sgailey]

You can try using heat to force the air out of the crack. The DS100 works quite well for this, because it heats a small area, gradually.

I would not recommend attempting this during the pressure cycle. Apply heat close to the glass, about 1/2 in. from the end of the troublesome leg. Continue to apply heat until you see the tip of the crack begin to close. Apply additional heat if necessary to close the crack the rest of the way. If the crack is indeed connected to the rest of the break, trapped air will be forced out of the leg as it closes.

Be sure to let the glass cool down before setting another pressure cycle.