Hello gents, i would tackle this a different way for 2 reasons, 1) because i'm lazy, 2) because of my limited welding ability and i think it'd be a stronger weld in the end. Cut the sleeve in half and and remove a further 5mm from the end of the offcut. Fit the shortened offcut to the axle hard up against the bush(this is important as it will stop the front axle from moving left to right) and tack weld in place. Now put the wheel on the stub axle and fit this over the axle and prop up the mower on a bench ensuring all 4 wheels are flat on the table top. Now tack this in place. Once your happy with the way it aligns finish off the weld around the axle. Job done! Here's a diagram of what i mean
