I am a machine technician in Oklahoma. I work on machines that fabricate products sold by my customers . My customer that i would like to file a lien against is a cabinet maker. The machines that is serviced were essential to his process. These machines were used and worked on in a factory setting and supplied multiple jobs with product. Is a mechanics lien an option for my line of work?

I received a car from the widow of a customer in exchange for money owed for work done on the customers fabrication machinery of which I was owed 10 times of what the car was worth. The title was missing and the car had multiple problems of which I have spent time and money to repair myself...now the widow's son from out of state says that they found the title and want money or they will report the car as stolen. There was no written bill of sale and the title hadn't even been transferred from the original owner. He lost the title when he bought the car and never transferred it. I live in Oklahoma. I last worked on the equipment within the 4 month period in which i can still file a mechanics lien but the equipment has possibly already been sold to a local shop. another thing, he owned the house she lives in and took a loan out against it for his business. He was not incorporated. I now wish to file liens on the machinery in which the work was performed if at all possible..