This is yet another long key, if you make lots of keys for fun as I do, then you often end up with a box of bits and pieces left over from previous / failed projects, and rather than load up the scrap bin I usually make a little fun key to use them up, and here it is, the main arm consists of two pieces of brass  joined together giving a thinner end to the arm which helps the balance,  a brazed bearing holder and tiny contact section, its also fitted with Neo disk magnets as the tensioner which gives a very smooth adjustment, It has a very pleasant crisp machine like action medium, nice key