I Put In Go-90 Grade Grease With A Relatively Inexpensive Short Style Grease Gun And Cartriage Then Closed Back The Opening Cover Screw Facing Up Towards Me ..(thicker The Better For That Inside Worm Gear ) And My 58 Bird Steering Box Leak Was Solved. .you Got To Be Patient It Took 1 Week But The Thicker Grease Gravity Pushed Out The Old Thinning Grease That Was What 50 Years Old. Again , No Leaks. P.s. What Fool Put These Steering Boxes In Without A Universal Joint To Columb For Ease Of Service?