Definitely don't leave it in place unless in use. I haven't actually done the rubber washer thing because mine doesn't turn on its own anyway. Just surmising that if you found one that could take the heat, that would likely do the trick. Maybe something like this: https://www.amazon.com/HIgh-Temp-Silicone-Washers-10-Pack/dp/B01J1V7RCM
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