Quoted from SealClubber:These should be grounded IMO. No comment on the person who had the short and would rather ungound the blades than fix the problem.
I'm surprised this wasn't addressed in the designing of these in the first place... could be a potential for a law suit I think, I can see it know:
selling off high end collection of pinball machines due to the fact my husband was electrocuted while playing his favorite pin with so and so's mirror blades installed that were not properly grounded... just peel and stick it what it said... looking for a good attorney.