i have to remove my garage to make way for a new single story extension the size is 4mt x 6mts so a lot of it...... i have a kango 900 which is a powerfull tool but its making very slow progress on this thick concreat which is around 50 years old,,, what i need to know is what should i hire for the job? any advice from any one who comes across thick concreat in there line of work