So, I wanted to go at the guy for not reading your article but in reading it myself I did find possibly missing something. Like, they talk about them fitting within one another but then show that there are definitely differences. Maybe it’s a case of the same number screwdriver not being equal but +/- 1 number gets you back on track, I dunno.

The article definitely isn’t fully selling me on what they’re saying, though. I own a 1986 Ninja 1000 and have done extensive work to it(engine in half, whole bike in pieces at one point) and there was definitely something up with the bolts. I replaced them all with new button-head and socket-head hex bolts and life was much easier.

Have you ever turned these screws personally before? They are not perfectly compatible, just barely passable if the screw is in good shape and not too stuck.

Tell that to guys with Japanese motorcycles. I still get people bringing me engine parts to remove the messed up screws. It costs real money to get me to fixture those parts in my mill and indicate the hole in and then very carefully remove your stupid.