[2d] Moving objects one by one along another object

Hi everyone.
I can’t understand how can I do this trick.
In my case, I need to move chainsaw blades around bar (pls check screenshot). Each blade should be a separate object.52630-безымянныи.png
I tried to use unity animations and itween, but i’ve faced a lot of problems. I just can’t understand how can I move these objects consistently, straight around the bar and without rotation issues.

Is there any easy way to do this?

I would be very grateful for any ideas and advices!
(ps. sorry for bad english)

Sprite animation is the way to go, to keep it clean.

yes that a great idea no doubt