I've also just found a vid where someone demonstrates the same idea on a different model Singer. For that one the placement of the rod under the bed of the machine that has the "bolt and nut" on it is slightly different but aside from that everything you need to do to make the adjustment is the same. Search for "Set feed dog lengthwise in Needle Plate - Singer Model 301A". You can speed it up if you want by pressing <Shift> + <.> while the vid is playing. You can press <Shift> + <,> to slow it down again. (The more times you press the more it slows it down or speeds it up.)