I have a Harbor Freight 7x10 mini lathe and just recently the auto feed won't engage properly. I've made a lot of pretty cool things and everything normally works well but I'm fairly new to using this and not sure what may be going on. It has the lever you flip down which engages a piece upwards into the worm gear to make it work. If, when I flip the lever down I also push up on this piece it will engage and stay engaged as long as I keep up pressure with my finger. Any ideas? Any help would be greatly appreciated.