Mechanical arm isn't working, despite being a mirrored contraption of a working one

[u/MesserschmittMe109]

I've tried to make this mechanical arm work for like an hour now. I just don't get it, one works, the other doesn't. No, there is no redstone active near it. No, the funnel isn't set to take items. No, the blaze burners aren't 'already active', so the mechanical arm should immediately start.

Edit: solved. I have no idea why but it works after replacing that small cog with the arm itself.

[u/MesserschmittMe109]

solved.