Have been working on Singer and at first foot was stuck up and would not come down. Last problem is feed dogs go up and down but DO NOT move forward and back ward. Any ideas on what to do? Have oiled it well with tri-flow oil and hate to give up as it is a machine with cams, never had one before.Hoping there is an easy fix as my hands don't have what it takes to take it all apart. Arthur is making his presiense known and hands seem to be taking brund right now..