Quoted from Skypilot:
I'm not understanding the question. You are removing both parts of the roll over. The star and the round disc together.
I think he's confused in that it appears you're only removing plastic from the hardtop, and he seems to be thinking there's some risk to doing it by hand like your video. Also, AFAIK, theses aren't any different than rollovers in any other game with star insert rollovers. The only way around having to do this would be to have them be laser or die cut in production, but that might cause alignment issues, as playfields are never truly identical.
If I'm understanding this right:
1. before installation of hardtop, remove star inserts from playfield
2. install hardtop
3. Use dremel tool to sand/cut away the extra plastic that would end up being OVER the star insert. (You are not modifying the playfield ITSELF)
4. Insert and glue the star insert, making sure it's flush with the top of the hardtop.
My dremel DOES have a depth guide/cutting kit..whatever. Looks like a cone. I suppose if you're paranoid about slipping it would work but I'd be afraid it'd leave a bunch of scratches sliding across the top. Doesn't seem necessary. Just go slow and be careful, and clean up carefully.