I have not one but two ETA 2783 based watches ... both of which need new stems. These stems seem special in that they are helical i.e. the rectangular section at the end of the stem is twisted. Cousins lists them as 'Obsolete' and whilst I see some on ebay the price seems high for a stem (partly driven by the fact that none are UK based so postage is a factor). So my first question is why a helical stem? This might well answer my second question which is ... could I 'get away' with a n