As Ultra said, you can remove the valve screw rivet. Catch the edge of the rivet with a knife blade and carefully pry it out. Remove the valve screw and replace the o-ring with a Viton O-ring, then tap the rivet hole for a #8 screw, blow out the debris and then reinstall the valve screw. Screw it in and then install the set screw. I used a gas resistant sealant on the set screw just to be sure it did not leak.
If you decide to drill the rivet out, be very careful, the dril must be perfectly centered so you don't end up with and elongated hole.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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