Installing inserts on the first 12 playfields. Here is how i'm doing it. They get epoxy to holes for inserts, & I level them with a oval insert. This makes them flush or slightly below the surface. After they are all installed they will get more epoxy to fill in any gaps around the top edge of inserts.
I do a grading system before I start the inserts. Each playfield is inspected & gets a production sticker. A - no flaws in cnc, B - less than 1/4" total surface are of chips around some inserts holes, & C - anything above 1/4" surface area that needs repairs (edge damaged or ripped top maple veneer). So in reality of my production A & B are considered the same for playfield plywood grading.
All inserts are hand inspected by me & sorted. Grade A, B, C, & rejects. I try to use the same for each grade, & if possible use a A grade close to bottom for B if available.