Armor question

Im restoring my Boba armor and It's made of Styrene. My knee doesnt have that dent on the edge. Does anyone have a suggestion as to how to put that dent in it?

Lynn TXP 0369

Well-Known Hunter
On my knees I had to make my dents and I took and heated a spot where I wanted the dent with a lighter until it got really soft and pushed in the spot with a thick marker to make my dents.
Just gotta watch getting it too hot as it will scortch the plastic melt it more then you need it to.