Quoted from HeyItsMeDusty:I'm only 6 years late to this post, but here I am! Same problem as the original poster, but I was thinking of just replacing the cupped inserts with new ones. Most of the inserts on Grand Prix are unmarked, so no modifications needed.
Are there any considerations I should keep in mind if I do a full replace on that many inserts?
Dusty I have replaced inserts before and while it’s a great solution there is a risk of causing damage getting them out. I have also filled them with 2PAC and then clear coated the entire playfield. Sometimes I do a combination of both.