TM 10-3930-659-20 17-13.    CONVEYORIZED FORK ATTACHMENTS MAINTENANCE (Con't). 3. Install  bumper  (12)  and  mounting  plate  (13)  on conveyor tip (5) with two washers (14), new loch washers (15), and screws (16). 4. Install  four  bearing  units  (11)  and  eight  spacer (10)  on  conveyor  tip  (5)  with  two  pins  (17)  and four retaining rings (9). 5. Install conveyor tip (5) on conveyor frame (7) with pin (8) and two pins (6). TA707649 17-50