PTRider
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It sounds like a job for the mechanical repair contractor I used to see on the jobs I was working on...BF & I...brute force & ignorance...motto: No job too small; no hammer too big.
Seriously, this is a tough job. As said, you might be able to very carefully drill the head off the screw. Soak the screw threads in a good penetrating oil, maybe Kroil or B'laster PB, and don't waste your time with WD40*. After that Vicegrips might get the rest of the screw out. With the brake fluid removed, heating the body of the unit might help...don't use a flame that will melt the aluminum. Or, heat then cold shock with ice. Anything to break loose the crud holding the screw in.
I had an Easy-Out work once...once in 35 years.
In the future, be real picky about the tool used on the screws and bolts. It might be work buying a set of JIS screwdrivers instead of Phillips, use only 6-point sockets and box end wrenches, and be sure any Allen wrench is in good condition...grind off the end if it's worn.
*WD40 is, as the name implies, the 40th recipe for a water displacing product. It displaces water well. It is poor for lubrication, penetration, and rust prevention.
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