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This is available from Aerospace tool suppliers. It has a 3/8" square drive at the end which accepts variety of bit holders/sockets etc. It fits into an air chisel/rivet gun.

I have used one for 30 years and have never had a removal failure.

You can control the twisting force unlike an impact gun!

I agree, but your missing the safety spring. I have over 30 yrs on mine too.

Steve Corbett wrote:I agree, but your missing the safety spring. I have over 30 yrs on mine too.

I do have various safety springs.

Hey Ron, do you think there's any chance of the rusty self tappers (Philips head) surrendering to the beast? I must have one of the most securely secured Zender kits going. This is one of the good ones!

Scrape out the slots with a scriber and the tool should do the job. My garage guys have borrowed it today to remove the brake/fuel line mounting clip screws.

Like Ron says, scrape out as best you can and use plenty of WD40/penetrating oil of choice. I have sometimes had to resort to very accurate use of a Dremel and a small cutting wheel to make a slot for better purchase on some very corroded screw heads.