One mystery part - mildly disconcerting

After taking it apart and putting it back together, one spring that won't fit anywhere. 

This Blickensderfer 7 was also one key-lever spring short. The odd thing is, that the remaining spring will not work as a key-lever spring; it's the wrong shape and simply won't fit. In the end, a new replacement key-lever spring was formed out of piano-wire. This new spring is a great fit, in fact can't tell it apart from the originals, and all 28 levers are held up properly. But the left-over spring is a worry - no idea where it came from.

All 28 key-levers have their spring to keep them in the up position. In the middle of the machine then the two springs that work the left and right rotation-bars, these springs have a proper loop to go on studs. And finally there is one thicker spring to go on the universal bar.

Couldn't fit the mystery spring on any key-lever, just couldn't make it fit. 

Maybe later I'll discover how it can fit a special key-lever that needs it - maybe it simply was a 'wrong' replacement during servicing long ago. Or a 'whim' at assembly of the machine, even longer ago.

The other thing is that this Blickensderfer works flawlessly without this mystery spring. 

mildly disconcerting

:)