The only way I’ve ever packed all of the parts into only four parts cans is to use a long pair of tweezers and place really big things like P 20s and Ms in the bottom carefully organizing them. Then you can pour some nuts in there and place other additional items like DB motor pulley or P 15 in the gaps. In another can, you need to place the FA screws and the 1 3/8 inch screws carefully in the bottom aligned. Once you get all the big stuff put in there, it’s not too difficult to get the rest in there, but I also put all the CHs together in groups of about 10 or 15. Otherwise, it is really hard to get every part into only 4 cans for a 10 1/2 set.