Can you guess what it is?

Mondays. Yuk. But today was a quietly constructive day spent making these heavy beasts and I'll be impressed if anyone can guess what these are. I went to a museum last year in Edinburgh called the people's story where the guide showed this tool off and explained how noone had ever worked out what they were for. I let everyone have a guess then told the guide the answer. His jaw hit the floor and then the cellar floor when I told him I was the only person in Britain who makes these. Now off to the library to show silver surfers the joys of on line shopping.