In end of 2013, after several weeks of negotiation, we get a order to make a 3m extension stick for a New Zealand client, In specification of their zx120-2 excavator, standard boom arm only dig 5m depth, After installing our 3m extension stick,the excavator can dig around 8m depth, ,
According to lever principle, longer boom arm should be with a smaller bucket, so we make a 0.2m3 bucket attached to our extension stick
