How to Remove the Cover of an Overlocker Serger Pfaff HobbyLock

How to Remove the Cover of an Overlocker Serger Pfaff HobbyLock Normally white, this machine, from the 80’s has discoloured over time. Grease is solid and congealed inside the machine and the joints are dry of oil. The machine is built well and is a more solid and structured version of the Singer s010L At 9:30, the machine is banging, I meant to add notation, that the take up lever is hitting the metal cover on its fix this, I had misaligned the looper cover so I unscrewed the front cover by loosening the screw at the bottom on the front panel, shifted the cover a hint over to the left, so now it sits flush. The sound of the machine changing speed is a switch in the pedal which allows the machine to run at two different speeds. Please support me and my channel to continue Thank you