While at dinner with some air cooled car friends Thomas Lubbock pointed out that the Calculator he had sold me, some years ago, was missing it's pusher!! Last time I needed a pusher it was a 2 plus year search. Again Abel was able to help and supplied the part only asking for payment if the part was correct. Stefan is a watch maker local to me (I can cycle to his place from work) who confirmed that I only need the cap/spring and put it back together.