Remove the trap door, the (2) nylon washers [1] from the top and bottom of the trap door, and the (3) plastic riders [2] from the bottom of the trap door. Replace the washers [1] and the riders [2] if they are damaged.
Apply Mobil 460 grease to the nylon washers [1], plastic riders [2], and the trap door guide slot [3]. Install the washers [1], riders [2], and the new trap door.
Install the bearing housing for the star assembly [4]. Install the vertical axle nylon nut and flat washer [5] in the carriage assembly. Install the cover panel [6]. Apply Mobil 460 grease the tool slots [7] on the star assembly.
Install the guide pin assembly [8].