As a schoolboy, I made from scratch a screw jack - aluminium casting, machine-tooled threaded spindle and brass sheath collar with a floating head. Very proud of it I was and have kept it ever since, hoping that I will use it, should the need arise. In the 30+ years since, I had used it only once. That is, until yesterday. Doing DIY in my kitchen, I found the need to support the weight of a worktop as I worked beneath it... So out came my lovely screw jack! The joy I felt may well have been irrational, but joy it was, nonetheless!