I'm not sure if I would rush off to buy another coil yet. I recently repaired a broken high tension lead on a Briggs. I stripped about 5 mls off each end and then soldered the wires together. Then I used a hot melt glue gun to build up the insulation material to the same thickness as the rest of the lead then added insulation tape over that. It sounds bodgy and dodgy but works perfectly. Also sometimes it's hard to see if you've got spark because of poor earthing. You can make a coil tester by joining (soldering) a piece of wire (I used 2 ml thick) to an alligator clip at each end. Attach one end of the wire to the spark plug gap and the other to the engine block. Cap the plug to the high tension lead and pull normally. This way you can get a good view of the spark plug and have it well earthed to the mower.
