This came in the mail from a leather working supplier haha, nice US made 7/32 hollow punch that I will hopefully be able to use to make some check valves!
I also have one Walbro check valve kit and a 10 pack of Stens 7/16 Welch plugs coming. I will use the Walbro kit as a reference for how the valve should look, and I have one Walbro welch plug as a guide to file down the Stens plugs to the right thickness. The Walbro check valve kits are almost $10 a piece now! That's as much as I paid for the punch. I have plenty of unused carb diaphragms to sacrifice to make check valves. Thanks again to Manic84 for all the ideas!
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I'm a bit late to the party but... Awesome! ($10 for each kit? That's nuts!)
To file the plugs down I used a raker file, it was perfect for the job. It doesn't have to be exact, just close enough to the original.
Let us know how it works out.