Hi,
They make specific sockets for stripped bolts. You can try something like that. Or, go to the next smaller size socket and see if you can hammer it onto the bolt.
Other than that, you will need to remove the spindle to gain better access to the bolt.
I know these things can be extremely tight. That, in addition to corrosion and dirt, makes them really difficult.
I attached a pic below of what the extractors look like. They are designed specifically for the removal of rounded-off bolts. My biggest concern is if the bolt will still be too tight for them to work.
Let me know if there is anything I can do to help or if you have other questions.
Take care,
Joe
See pic below.
Image (Click to make bigger)
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Friday, May 28th, 2021 AT 6:58 PM