Try using a bushier flame if you can. You don't need to blast it to keep it warm, just bathe it in a gentler flame further out. Try making something smallish on your rod and see how long you can hold it outside the flame before it cracks, and find the areas next to the flame where you can park it and it'll still keep warm but not be directly in the flame.
If you brush a cooler area of glass with the flame it'll crack, whereas if you brought it in more gradually it wouldn't.
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