Gapping spark plugs. I have written articles on this, much to the delight of Tempest, who at first I thought were going to sue me for something, until I realised that was not their intent at all and quite the opposite. But rather than blab on here, go to this link.
DO NOT try to gap fine wires, because they do not need it and NO you can't buy tools for it. The ones you buy are for Massive Electrode plugs
http://www.tempestplus.com/Portals/0...ire%200813.pdf
http://www.tempestplus.com/Portals/0...y%20081412.pdf
http://www.tempestplus.com/Portals/0...ugs%201012.pdf
Enjoy!