The Performers can be a little intimidating to work on, but they are pretty simple. Take your time, and have fun making it your own.
I've worked on a few of these SS Performers, and rarely do they need much work on the burners/ignitors. Like Lawrence said, a good cleaning is usually all you need. First step is to pull off the wire clip that holds the assembly together.
Here's the clip, and the disassembled device.
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Make sure the burner tube is cleaned out, and also work on getting the face of this brass piece nice and clean. I use a wire brush to gently removed dirt and deposits. Then take one of the brush tines and clean out the small pinhole in the center.
There's a phillips-head screw attaching the business end of the ignitor to the burner tube... take that off and carefully clean the ignitor too. The grill I worked on today needed a new one, but the other two I've seen worked just fine without replacement.
Oh, and re: the star nuts. Though the guys at my local bike shop only ask if I want 'Inch, or inch-and-and-eighth?', they seem to come in three sizes. I have used the ones that were too large in the past, and they flared the ends of the frame tubes. Today I used the ones that measure 15/16", and they worked just fine. I used a hammer to square them up a bit so they don't press out on the flat sides of the frame tubes (there's a lot less effort exerted in pounding them in, too). Not sure if you can see the subtle squaring in this photo. (The price of the star nuts vary anywhere from 2 to 5 bucks apiece, depending on if the boss is in the shop when I show up.)
Put a bolt into the star nut, then carefully pound it into the frame tube gently and as squarely as possible.
This is a bonus photo that my daughter took while I was working. She has a real eye for composition.
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