Personally, those are my favorite end caps. I like the clean finished look vs the holes in the ones with that use bolts.My end caps have unthreaded posts cast into the mold. I have to use zip nuts to secure it to the metal lid.
I like those ends the best too. Maybe I need to order the nuts from Weber. I've been using what my local hardware store has, and it just isn't fitting super snug. They do the job and have held up for years, but it just isn't torqued down so I have a little bit of movement under the rim of the aluminum ends.Personally, those are my favorite end caps. I like the clean finished look vs the holes in the ones with that use bolts.
Those “speed” nuts work pretty well to me, and you can get brand new ones pretty cheaply.
They really are not meant to be "torqued" down
They just need to be snug. If you turn them past a certain torque, they will strip the aluminum post. Make sure you have the correct sized ones as well. One size bigger might seem like it fits, but really doesnt. Weber used a couple different sizes on their grills. The ones used with bolts are a bit smaller than the ones used on the aluminum posts.
I believe this is the size you need for your lid: https://www.amazon.com/gp/product/B0041C6LYW/?tag=tvwb-20
what handles are you using for the doors? Love those.I actually did that on my Genesis Platinum, but the Summit I got my thermometer from was the current generation and it had a very large round bezel that covered up those holes. You might see what it would take to get one of those bezels.
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It's a piece of stainless about the same thickness as the frame.What material did you rivet on the front of the grill frame above the doors?