Started cleaning the motor to try and figure out where it's seeping oil from. Tightened down the oil light sender. Does anyone know if there should be a bolt in this hole in the timing cover? It had some oil in it but I don't have any spare bolts that are the right size. I tried one from elsewhere on the timing cover but it didn't feel right - like it wasn't threading and I didn't want to force it. The hole is just below and to the right of the idler pulley bracket, you can see the clip that holds the oil light sender wire.