Originally Posted by
BoraxKid
I actually measured things last night; the dropouts are definitely 126 mm spaced. ..... The ideal outcome here is to end up with a 9-speed 105 drivetrain
If that's what you are after then the easiest thing to do would be to do a '9 of 10 on 7'. In other words, use a 10 speed drive train, but omit the smallest cog of the 10 speed cassette- turning it into a 9 speed cassette, which will fit onto the 7 speed freehub body.
You can also do what you are doing and narrow a 130mm hub and re-dish. But keep in mind that you are re-dishing in the 'wrong' direction- you are exacerbating the asymmetrical spoke tension.