Easy out! They should have came out without any of that prevantitive work. You need the hammer the T40 in there before you try and turn it or you’ll just strip it like in your case. They get dirty inside there and you’ll think the socket grabbed and it won’t.

You should just get an easy out though. It won’t damage the threads.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

Will this work?

https://www.lowes.com/pd/IRWIN-Hanson-10-Piece-Spiral-Screw-Extractor-and-Drill-Bit-Combo-Pack/1000363539


I'm going to have to buy a drill too, a ceter punch and maybe a T handle right?

Also what fastener can I replace it with, can I buy a generic hex bolt at lowes/homes depot or will I have to go to McMaster-Carr?

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.