Guessing you're asking because you've seen the whole debate blow up before. Personally, I always skip it on injectors, just a light coat of clean oil on the threads and torque them dry. Seems like every forum has that one guy who swears by copper anti-seize, and then another guy who posts a picture of a cracked head. It's like the oil change argument, everyone's got a "fact" they heard from their uncle's cousin, but nobody can agree. Take my advice with a grain of salt, I've only done this on a handful of diesels, not a thousand of them.

People always show the good angle, that's just how the world works now.

Skip the ice bath next time and just check the temp of your butter first. A cheap instant read thermometer is like 10 bucks and takes two seconds. I had the same thing happen with a ganache that kept seizing, I blamed the cream before I realized my kitchen was sitting at 80 degrees because the AC was on the fritz. The buttercream fix is usually the opposite problem, too cold butter, so you were probably fighting the wrong battle the whole time. Still, glad it worked out, that first smooth batch after three weekends feels like winning the lottery.

Funny enough, @andrewt41, that whole "verify it's still square" thing reminds me of the time I watched a buddy check his level against a door frame after dropping it, and the frame turned out to be crooked. So he spent ten minutes recalibrating his own eyes before realizing the wall was the liar here. Guess my point is, trusting your tools is one thing, but sometimes the world around you is the one doing the tricking.

Quarter turn? That's wild, most folks I know wouldn't dare touch that sweet spot.