What about it makes it "unusable" Peter? I have the 80mm version from SS and it's a ripper. Are you sure that the cell components aren't loose - i.e. has anything rotated loose allowing the flint & crown relationship to change? Are you sure it's the right way around? When the 80 came out everyone complained that it was hopeless - but they'd mounted it the wrong way around because it looked more natural to have it round the wrong way. A note was issued by SS asking people to mount it the other way and suddenly everyone's objective did as advertised.
Here's a shot through mine:
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