We just bought a used singer 241 and have a question. We changed the oil in the machine and cleaned it up a bit. We read in the manual that after they sit awhile to hand oil parts, till the oil gets started in the machine. We did that. We then ran the machine a little and have yet to see the oil going thru the little peak in window. My question is, how long should it take to get the oil moving and is there anything to check before this happens?