Damn, would you believe i had exactly the same, i wire wrapped around the screw fitting. Must of been the done thing back in the day??
Luckily I also have a 2a, so the choke cable may be useable as a stop cable, but ill see. If i come up with some solution ill sure let you know seeing we are looking at the same issue.
All the best with helping your mate out, life gets in the way of a Landy project sometimes :)
Cheers,

