I would think that would be impossible, I do not think that a standard HSS drill would simply pass straight through the centre of the spring, if someone was drilling the springcase in situ for some odd reason I am sure the drill would simply deflect the spring out of the way or break the drill, it is curious, the drilling has all but severed the spring, I am sure in use it would snap very quickly, I am with Timetraveller, scrap the springs and buy new.That’s not an easy place to drill a hole. I would think it’s been done by accident, probably by someone drilling through the spring box for some unknown reason, but you’d think they’d have noticed when they hit the spring.
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I would think that would be impossible, I do not think that a standard HSS drill would simply pass straight through the centre of the spring, if someone was drilling the springcase in situ for some odd reason I am sure the drill would simply deflect the spring out of the way or break the drill, it is curious, the drilling has all but severed the spring, I am sure in use it would snap very quickly, I am with Timetraveller, scrap the springs and buy new.