Thread:MailleKerchief/@comment-27713488-20160311153856/@comment-27886747-20160311183400

I checked in a dictionary before I made the change to make sure that my impression about the difference in meaning was not just me:
 * mechanics
 * mechanic

So according to that, "mechanic" applies to a person, "mechanics" as "the way something works" ends with an -s, though it looks like that it's not always treated as a plural noun.