But more realistically, there are a host of jobs that you simply
cannot accomplish if you don't have the correct puller, spanner,
whatever.

Like changing a oil filter on a 2006 Ram Cummins. You have to be strong as
a gorilla, have to be able to lay on your back, and reach up and take 1/8
turn at a time. That is, when you get the workings of a regular filter
wrench on there.

So, I butchered a filter wrench, cutting off the handle, welding on a socket
with a 1/4" drive end. And still, you have to put the wrench up there, hold
it, insert the extension and driver, and click it all together. WTF are
some of these engineers thinking about when they design some of these
things. You can put an oil filter in a lot of places, many much easier to
reach than where they put them now. Loosening motormounts to remove spark
plugs on some cars, things like that.

Steve