> That's 30 degrees (nominal) included angle or 15 degrees per side.

Thanks, that put my mind at rest.

I would have preferred to buy a Spiderco Sharpmaker but I couldn't find a UK supplier. The Gatco seemed to get the best reviews of what was available. I knew I needed something because I've failed at sharpening for many years. My RSK was well blunt after I'd applied a steel to it. <img src="/images/graemlins/frown.gif" alt="" />

I don't think the Gatco Edgemate Professional is as good as the Spiderco. The instructions weren't really adequate. It tells you to grind a certain number of times, with no mention of forming a burr. Also, the grip is poorly designed and doesn't, well, grip. I found it helps to put cardboard between the grip and the blade.

However, the stones remove metal alright and the system does help keep a consistent angle. I've got my RSK cutting arm hairs again so I'm happy for the evening.