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I use Permatex 81730 Flowable Silicone Windshield and Glass Sealer which does not contain acetic acid and is designed to bond well to glass. It holds the base on tightly but has just a little give to it.
It's my understanding that using a very hard adhesive like epoxy could cause the glass to crack if it has a different coefficient of expansion. Those necks can get pretty hot during operation.
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