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Many thanks to all of you for your replies.

I will try Russ's suggestion (to avoid throwing 60 euro down the drain) and failing that look to acquire a DMT as suggested.

I should have done more...

I bought this stone to lapp my naniwas a few weeks back when I bought them and have tried sandpaper/wet and dry without any success down to grit 80. It wears down the sandpaper completely and...