Thanks guys. I'll look into JB weld, though I have a spare tank/carb here, might see if I can get that working. The mower is only B&S Rover (092508-5155-01), can't remember where I got it, but it was incomplete, that I stripped down (inc. casing), and trying to put back together with spares I have from another mower.
Shame about the fix though, was hoping there would have been an easy solution. Think too thin to weld, though I've seen videos of people patching with copper(?) and solder.
