First,... open that door on the left, that hides the needle bar. Push the needlebar to the right. Does it move? Does it spring back? Oil the dickens out of everything that looks like it's metal rubbing on metal. There are a LOT of places that should be oiled that they don't show in the manual. Ideally, you would have triflow here, but heat and oil will work too. If it doesn't push to the right, or doesn't spring back, then there's a serious need for oil there too. It's the "other end" of the zig zag mechanism. Now, follow that mechanism to the right, and see the "flippers" that move to control the zig zag. oil everything in there that moves top and bottom. Do not remove the cams. It's not necessary at this point. Now go to sleep.
Check on it tomorrow. I will keep trying to find Joe's pictures.
Oh! And the "pins" are what the stitch selectors ride on. If you follow the stitch selector, you will see that they end in a sort of "collar" around a sort of pin that has horizontal slots in it. Oil the dickens out of both of them.