They are all the same. It was some kind of strange thing about how the Chinese measure one way and us another, upshot is they are the same. Find a new jug on eBay as long as it isn't one of the newer Grubee motors, like the Super Rat. For the most part the parts are universal. As long as the hole dosn't go all the way through I don't see why you couldn't use it. I don't think it could hurt, there's no compression where it's at, the rest of the time the piston skirt is over it so unless it's sucking air it should be ok.
You could also try Alumiweld. Its really a solder for aluminum, it needs to be 750 degrees to melt though but even with the fins carrying off the heat I think it would still work. Put it in an oven turned as high as it will go, so that's like 500 F. A good sized torch and melt the Alumiweld into the hole. Put it back into the oven. Turn the oven off and take the cylinder out when it's cool, give it an hour or so. Now, if it hasn't warped it otta work.
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