First clean the cavity (sharp long knife works well) then use a grease brush and genrous grease , the packing (4) go with gaps at 6 and 12 (alternate) use thumbs to start then a packing ear (with your hands) as a tool to move them back , after 4 put the ears on and use VERY slight tension evenly on the packing ear nuts Call if you need help Tom
Down the road go back and add the 5th if needed !