This New Key Project will be based on some different bearings I've obtained, they are pin or roller bearings, I saw a picture of a quite unique key which I'm sure used this type of bearing, so far I have just cut the brass and made some bearing holders, they are quite tricky to fit as the rollers rotate on the actual axle of the key unlike a ball race that has its own rings which fit against the axle and the bearing holder, all of which demands more accurate metalwork, I have two possible designs, this one which uses two stub axles and a bottom brass mounting plate the other is a solid axle with the body of the key mounted on it, which may become key053

Other than the different bearings this key has turned out to be fairly standard, the only "YUH" aspect of the key is the contacts arrangement, the contacts are on a sliding bar and locked in place with a screw this becomes an adjustment that can change the "rake"  or angle of the main arm, the tensioner is my favourite format with a very wide knurled adjuster, just the gap adjusters to fit and its finished, to be honest the roller bearings don't seem to have any advantages over ball races,  its a nice key but a bit to solid and machine like for my liking :()