Re: Old break
If I push on those batwings before I start and there is no flex movement, I usually drill 60% way down. The reason is cuz I've had some just like described that you think you're filling but apparently they're deeper below the surface. Also seems like carefully using heat safely works on those. That's one of the things that the glass shops around here just set the bridge on for 5 minutes, whatever fills fills, whatever doesn't doesn't. So back to the original post. I think usually drilling and popping probably should get it.
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