Do you have the original design that has the T shaped gate or the Mark 8 design? What blades are included in your system? Do you know approximately how many years you have owned the system? The reasons for my questions are that McNaughton has evolved the design of the system over the years so blades aren't may not be exactly the same if someone currently owns a McNaughton system and wants to augment the set that they currently have. Also, depending on where you bought the set, it might not have included the straight blade along with the three curved blades.
I would recommend including either an email address or a phone number for people to contact you. The reason is that a lot of potential buyers may not be members of this forum.