No luck on the weed spraying site. So...I have a Permagreen Ultra power fertilizer spreader. 6 hp BS with a Peerless 4 speed transmission. Centrifugal clutch. But shifting is very difficult, too stiff. I need both hands. Suggestions? Does it need oil? Where do you put the oil? Can I unscrew the neutral safety switch to check, or fill? Thanks for you advice.