I was actually in the market for a wrench like blind sniper when I first started to tech'ing my own BASR, however after the suggestion of various posters here (either 1tonne or PlasmaBurn), I just used needle close pliers. I just ptfe tape the nozzle like crazy to protect it and electrical tape the end of my pliers. That's saying alot cause I'm the type of person who follows the "right tools for the right job" dogma
I’ve been using needle nose for years and only slipped once or twice! Luckily no serious damage was done. I’m just throwing together what I call and “ocd tool kit” with all the fancy proper tools that meet my overly strict standards lol. I ordered a torx and allen set from Amazon but they had to look a certain way and be a certain color. I have issues lol.
I just took a small plank, drilled a hole the diameter of the nozzle, and then drilled a smaller hole to stick a peg through that would line up with one of the cylinder head holes. This worked well enough.