If it were me I wouldn't just ask for the grill. I'd start a conversation about grilling and BBQ and get to know them a bit. Make some small talk, like @mhiszem said get a backstory if you can. Then tell them about your hobby and passion for older kettles and if they would ever consider parting ways you have an offer for them. If they say no then thank them for their time and maybe leave your number in case they ever change their mind. Good luck.
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