It sounds like the screws must have broken fairly easily, so must be rather soft. But getting something into 2.5mm[?] holes to try to make a slot on what's left doesn't sound like fun.
You could search for something like a 2mm left-hand- thread drill --- or you could search for a skilled local machinist that hasn't been bought a beer lately. (better thought: a watch repair shop?)
Good luck. A quick google tells me that one does not just throw away something like that :/
Yeah, a machinist with a small drill press, or maybe a jeweler, should be able to carefully drill out the screws, likely even saving the threads in the cart. Good luck!
Oh god, that totally sucks. Did it break off flush with the top, or inside the hole, reason being if flush there's a chance you could place the cart in a vise and use a dremel or similar to cut a slot. I would first contact Ortofon or your dealer, maybe at least get a sympathy discount.
I know nothing of how a cart alignment comes into play, but can you jb weld some all-thread at the sheer and attach nuts to secure the cart? Edit: Oops, looks like Stapsy had a similar idea.
It's a pretty hard way to learn the lesson: go easy with that torque!
Unless the jeweller you go to is a watchmaker too, I do advise the watch-repairer route. Speaking as a one-time hobbiest jeweller, with a fairly well-equipped workbench, I don't think I could have handled that. Jewellers make/repair stuff that has to fit, look good, etc... but there is not much involving mechanics.
Brilliant. people are usually very gentle with record-playing equipment. Surprising that screw would sheer. They may be small, but so is the amount of force that can be applied to a tiny screwdriver. Screws/bolts I have sheered: much larger, but with the help of foot pounds applied on the other end of a wrench.
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