Transmission Drain Plug - Add On - Anyone done this

I've installed 2 that you get from the local auto parts store for $7 or whatever they cost. They use a chinsy washer that causes them to seep fluid; both my trucks would accumulate enough fluid to form a drop, but never hit the driveway.

They don't get all the fluid out because of the protrusion, but makes for a much cleaner job.

Take a look at internals to make sure they're is enough clearance for the drain assembly and not contact the valvebody or a solenoid.