Neil words are fine but my knowledge is not great. I am sure people already noticed that English is not my first language. That is also the reason why I am not realy enjoying academic research about hones and would rather walk few miles and look for the knowledge manualy. I am sure you know what it is when you sitting in ruin of old slate dressing works and imagining what those workers used to do around you or when you find at local carboot sale somebody selling part of rockery or a ball of crud which fits to what you looking foor. That is where for example my Moughton is from.