Some items in the store (like the hat lights, and the machined bellows) are subject to rolling estimates as they're supplied by outside stockists... And thus subject to whatever delays those stockists might unintentionally incur. Is there a specific date you need it in time for?
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No, just curious. When the date slips without explanation, it sounds like there's a problem. I'd be more comfortable with a long lead time that is met rather than just watching it shift indefinitely.