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Go to any auto parts store and look for a tool called a "reamer" it looks like a spike with 7 or 8 vertical tool steel flutes on it and it has a square head to fit in a tap handle. Get the 9/16ths dia one as it is large enough so you don't break the tool in use.
Spray penetrating oil around the busted sleeve end and let sit for 30 min. Take the reamer and fit it into the brass sheeve and tap it with amallet/hammer several times until it does not want to move up/dowm/left/right. Use a 12 in long crescent wrench and latch onto the square head of the reamer and SLOWLY rotate to the left while pressing in. It should bite and start to come out, If it slips, tap it in again and keep trying.
Art says to try beeswax into the threads of the brass sleeve, if you can find a beeswax candle, drip the wax onto the edge of the treaded area and let it work its way into the threads (a wee bit of heat here might help) then try the reamer precedure.
I used to overhaul Concrete Air Testing equipment and the field techs used to break the 4 in gauge off the top of the air pump on a regular basis leaving a 3/8 sleeve in the threaded hole and nothing to latch onto so I tried the reamer trick and it worked every time. Now I was dealing with concrete coverted metal (aluminum and steel) and it always worked, so a brass sleeve in and iron block is no biggie...
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