rs4 evo 3 + flywheel issue

[newbie1]

well i got the car and broke it in an drove it today but i guess a rock pop up and hit my fly wheel and its got a noticeable scratch in it and when my car is idling it sounds like it catches and shuts off i bought a new fly wheel for 5 bucks so I am gonna replace it.

wondering if there's something could do to keep this from happening the whole is rather small under the chassis where the fly wheel is could i just cover this with a peice of duck tape to prevent it from happening again? does this sound good