This is interesting, my Victa pro 12 has the same drive system. Hope it still works after sitting in a barn for 25 odd years. I'm thinking it will be best to clean all the dirt, dust and crap out the pulleys and such before I take it on its maiden voyage after being brought back to life. The Victa has a foot pedal drive selector. Does anyone know any info on these things in the pro 12's? Have not really found any.