His the man but he cant post directly back to you but I can ;-) he blue prints for £75 and will fix it,thats cheaper then a service from BSA.
feel free to pm me,you can send it to him,pay the return post and I just drop it in parcel force,no problem.
Bung me 5 quid petrol,in fact I dont even care.Im literally 2 min away.
Dont send it any one else,him or BSA.
other wise youl be wasting money on hoping they can do it when John or BSA will do it.