I have a troy built cultivator plus, and I am looking for a user manual for engine and gear oil chages ect. and possibly for a couple of parts if they are available. can you help? The s/n is C012548 not sure about the model number but I think it's C100. if you require a picture let me know and I will supply one. I am looking for the manuals but will take any info you have on this unit. Thank you very much.