Short story: A friend could fix ANYthing on his Chevy van. But when he got the Kenmore trans out and apart, it sat on the porch for a week and he bought a rebuilt one.
Like a skunk its first line of defense is the SMELL! Like year-old frenchfry oil in an abandoned restaurant. Next, one comes to realize that ALL the parts are worn, not just the one that finally broke. So if you're going to replace EVERYthing, makes more sense to buy it that way already done.
Just a POV.