Fible,
The reason for the vibration is either you have throw a blade or part of it off the blade plate. This will cause that problem.
The carby when you have a look at it where the float sits on is a couple of holes and one has a brass seat in it that is where the needle goes.
If you require information e-mail me on support@copepl.com.au and I will forward you information on the carby to assemble it correctly.
Regards,
Bruce
[This message has been edited by Bruce (edited 10-02-2002).]