Remembered I had the same problem with a 5.4 back in 2011 and bought one of those fancy swivel sockets for like 30 bucks. Used it twice, dropped it into the abyss behind the intake, and never saw it again. The wobble style Dale showed you is a whole different animal though, that built in play at the base is the trick. My old man ran a regular u joint on his 302 for years and never snapped one. The aluminum head thing is worth thinking about since the plug threads strip easy if you get crooked on them. I'd say the swivel setup actually keeps you straighter than a floppy u joint ever would, so it may be easier on the threads, not harder.

Wait, closing vents in summer can trap moisture, not stop it.

I read somewhere that root flare depth is one of the top reasons young trees fail, and it usually happens because we trust our eyes instead of a tool. The problem is that 2 or 3 inches is really easy to miss when you're moving fast and the soil is dark. Sounds like that probe paid for itself on the very first job.