Oh ok, wow pleasantly surprised that its so clearly fixable - thats good as he said it was one of the better ones he had before he did that damage to it.
Surprised that such basic fixes are acceptable - might see how welding it goes first - only have a basic arc welder and am no pro at it but should be able to plop a bit to fill it easy enough - if it's tricky I'll go the other routes - the pop rivet one actually seems pretty fool proof as well.
Use grease to capture the shavings if you take that route.
Hi MF, can you give anymore info on how you'd recommend doing this? I was just planning on flushing the cylinder out with some old petrol or kero etc so no shavings were left in there, but open to better approaches to ensure this is thoroughly done. :-)