wow, this forum is amazing! that was my first post (after the introduction) and it generated a really cool interaction.
Thanks so much to everybody for the answers!!! Also to the funny ones Well, in order to bring some additional confusion, I could mention that after reviewing the cylinder with the mechanic he noticed that the barrels below the base had one side 2 mm wider than the opposite side.
This fact remarks that someone was wrong regarding the barrels angle. We assumed that the the boring machine was set 90°, which could give some credit to the version of barrels not at 90°. Or it also could be that they swallowed the fake version and ruined the cylinder.
So far I only have a collection of broken cylinders and a forgotten bike that doesn't roar anymore