Because I had my grill on and off a few times this weekend, I found a way to be rid of the crappy plastic push pin things and use real metal hardware. I found all this stuff at my local Ace/Westlake hardware.
You must do a little drilling to make this work.
In the first row are the rubber well nuts, .375 diameter, 1.051 long, .312-.643 grip range, with a 10-32 brass insert. If you're not familiar with well nuts, they expand and shorten as you tighten the screw in the threads, which are in the bottom end of the well nut.
In the second row are the stainless steel spacing washers, .375 I.D., .875 O.D. The O.D. is important here, as they have to set in the indentions in the grill. I used these because the measured thickness of the grill and the support is .285. The well nuts working range is .312-.643, that made me ~.027 short, so the washers are about .030, enough to meet the minimum requirements of the grip length.
In the third row are the stainless steel washers, #12, that go between the screw head and the top flange of the well nut. These provide the neccessary slip surface by keeping the head off the well nut.
In the fouth row are the screws, 10-32x1.00. These barely engage the threads when put in, I should have gone 1.25. These work though.
This is how it goes together, the two washers sandwich the well nut flange, and the whole thing inserts in this configuration.
You must drill out the holes to .375 to accept the well nuts. The holes are already at .312 (5/16), so I stepped drilled to .343 (11/32), then to .375 (3/8).
Take the component assemblies and insert into the holes, making sure you have only engaged a few threads. Push on the screw head to seat the assembly. The large washer should fill the indention nicely. Tighten the screw until you feel some resistance and see the flange of the well nut start to distort. Caution:The screws will not tighten completely. Do not over-tighten, as damage to the well nut will occur.
To remove, loosen the screw until it is clear of the well nut threads, then re-engage a few turns. Pull on the screwhead and remove the assembly, taking care not to loose the large washer. It may flip out of the hole. Ask me how I know this
That's it, you now have real, removeable, reuseable grill fastening hardware that not only looks good, but will not corrode.