Using my A code 22" Green MBH to illustrate this very simple how-to.
This is how I rescued this kettle many years ago. First, drill out rivets.
(http://pics.weberkettleclub.com/images/rsz_20200513_155443.jpg)
Be careful not to enlarge the holes. Start with smaller drill bit and increase in size till the rivet pops/falls out.
(http://pics.weberkettleclub.com/images/rsz_20200513_161018.jpg)
(http://pics.weberkettleclub.com/images/rsz_20200513_161414.jpg)
Here are my replacement vents I had. You can buy replacement vents or use donor kettle vents. If you require fasteners, stick to 1/2" long 1/4-20 round head ss bolts, nuts, and washers. Btw, every nuts and bolts on any Weber kettles are 1/4-20.
(http://pics.weberkettleclub.com/images/rsz_20200513_161705.jpg)
Here it is all finished.
(http://pics.weberkettleclub.com/images/rsz_20200513_162215.jpg)
Same procedure for replacing damaged lid vent. I would use carriage ss bolt instead of round head with slot or star for cleaner look. Need to take off some material off the square part of the carriage bolt but worth it IMO.
Nice write up @greenweb. Now pack that grill up and send it to me!

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Quote from: bladz on May 13, 2020, 04:07:12 PM
Nice write up @greenweb. Now pack that grill up and send it to me! 
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Thanks! You collect great condition Gen 1 MT kettles, so this useless old kettle is not for you. lol.
Button head bolt also works great on the vent. It fits perfectly inside the recessed portion of the vent. I had used carriage bolts but the smaller head on the button allows the vent to rotate more smoothly.
All my grills are cookers so I've replaced the rivets on most most them with button head. Makes cleaning under the vent much easier and also allow the tension to be adjusted.
Nuts are stainless either top or center torque lock nuts.
Locknuts, 18-8 Stainless Steel, 1/4"-20 Thread Size
https://www.mcmaster.com/90045A445
Locknuts, 18-8 Stainless Steel, 1/4"-20 Thread Size
https://www.mcmaster.com/90047A029
(https://uploads.tapatalk-cdn.com/20200515/f0a09aa3ee03c305acc1a56946e0e604.jpg)
Jules, thanks for that additional info. Great point about the button (and round) head being smaller than carriage bolt head.
Btw, what kind of date code is that?
Quote from: greenweb on May 15, 2020, 05:21:17 PM
Btw, what kind of date code is that?
That's an 18 LE.
(https://uploads.tapatalk-cdn.com/20200516/281e5ed526f593cb07482f89fa4dae7a.jpg)