Hi David, firstly my advice would be to get some new governor springs, once these have reached the point at which they are worn through or work hardened/brittle they need replacing. Governor springs should be available from Gary at DES in the USA, Sleemen & Hawken or stationary engine parts in the UK, you could try Rob at old timer engines in Australia. I will PM you the mobile phone number of another useful man in Australia, who might be able to help.
I cheated and took off the head allowing me to remove the entire fuel pump cover assembly. I have posted a couple of photos, please ignore the throttle control mechanism which your LD1 would not have. Hope they help.
Bob