The stock boot guard is a flimsy piece of metal. He made one out of 3/16" steel.
Other's have taken pictures of the joints pulled apart. The stock Ujoint relies on the knuckle to be full of grease to get grease into the ujoint. Not the best setup in my book.
The new style Ujoints have the zerk that you can either pull the boot to the side, or drill out the inspection hole and put the grease gun through there. Search on pirate, they have pictures of it all. You just have to wade through some of the BS.