Rebuilding Mk1 Eunos Diff?

[Zeemax_Mini]

As title, the diff on our mk1 eunos (I believe lsd?) has given up so we need to either replace or rebuild it. It's a real budget project so upgrading it to the Torsen one isn't an option, but given that an untested replacement is about £150 I was wondering whether rebuilding it was an option?

Cheers,

Dom