by mike.smith » Fri Jan 10, 2020 10:27 pm
From my original post:
"The inserts I used were: M12x1.25x17.5mm spark plug insert p/n 42125, from Amazon. But I might recommend the slightly shorter M12x1.25x15mm spark plug insert p/n 42123."
Which did you use? Might be good for others to hear and compare.