Must not go in Kitchens

Not the kitchen, but the shop on Whiteladies Road in Bristol. For those of you who don’t know of it, it’s a strange and compelling little haven of cooking, drinking and baking implements. I can spend hours wandering around, contemplating new things and wondering if I can adapt any of Simon’s ridiculous cooking implements to do the same thing.(the man really does have some fabulous retro gadgets)

On sunday I managed to escape with 2 small glass espresso cups and a fine thread microplane but while I was in there I spotted this. It was amongst the whisks and mixers but I have not a clue as to what it is. It appears to work like a spring as you can press the flat bottom bit down and it springs up again but no, no idea why you would need that. Any clues?