Originally Posted by ut_hucker
It takes a lot of grinding to grind down a rivet.
Not really. UHMW PE is very resistant to abrasion, which is why base grinders need integral horsepower motors and feed pressures in the ~50-100 pound range. They'll eat a rivet in no time.
The cause for concern has little to do with the rivets on the ski, and everything to do with why the shop guy wasn't paying attention. Grinding rivets isn't exactly a good thing for the dress of the stone. (understatement) That said, this is an easy mistake to make. Don't step quite hard enough on the feed bar, and this is exactly what happens. Mistakes like this are encouraged by folks (customers and employees) who think base grinds should extend tip to tail.