I am an ongoing subcontractor in Ohio. Our client has been paying us for over a year. They have now started to default on payments. We have not field a Notice of commencement as the type of work we provide is billed by the time and not the project. Some of the work was in assistance with their production as a refinery and some was in building up their facility (real property). They have acknowledged the they owe the moneys due. They were working toward getting us paid in full but they now appear to be getting strained for new investors. I'd like to make sure that a mechanic's lien is the best approach.