Hi Gromitdog. Just reading back through your posts, you say your bike is a 1973 UK 550/4 K3, we didn't have K3's in 1973, or 550/4 F1 or 2's either, both models were much later than 73. I know you say its a Mongrel but when you say you would like to return it to original, what 'original' do you mean 🤔🤔