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Re: P/S pump bolts sheared off
your drill holes don't appear to be that deep or is that just an illusion?
I would try redrilling that top one first and centre it and start perhaps with a 1/8 drill and drill it slow and then go progressively larger until you get a decent 3/16 - 1/4" easyout in the hole. highspeed on the drill will get you no where but a dull drill bit and it aseems to make the piece you are trying to drill out harder from the heat generated. it is patience in these operations that win the day. like i said before they are more than likely bottomed out in the thread which is why they are tight. this is where a shot of CO2 will quickly freeze if and contract the bolt. I don't think thatt CO2 extingishers are as common as they use to be.
another thing that you can try is having a nice sharp pointed centre punch in close to the edge and see if you can tap it out with a "small" hammer , but I would leave that until you try the east-out so that you do not bugger the threads first
patience
ron
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