The only option for the box will to be have it rebuilt, to have it unwound shouldn’t be a big job though.
Ha ahh, try Jon on here for bits, get lucky on ebay or join the club and ask Graham Potter (club boss) if he has anything or can point you in the right direction. The club is £8 a year I think..
drop me an email fritz (at) immersioneleven.com (get rid of the gaps and put an @ in where the brackets are)