Originally posted by TampIt
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If you are doing all this to rotating burr, then you will most likely have to replace the bearings as any impact applied like this, will almost certainly damage the bearing surfaces to the point where early bearing failure is pretty well guaranteed. Thankfully, replacement bearings are not expensive and well worth the effort to install. If you are unable to locate OEM bearings, take the old ones down to a Bearing Centre (or similar) near you and they will be able to fix you up...
Mal.

I would recommend first off soaking as best as possible overnight in WD40, or some similar lubricant to try and loosen up. Might even be worth making up a solution of backflush detergant and spraying over the screws, this might help remove coffee oils that have penetrated the thread, and then soaking in WD40. Doubt this will enable you to remove them with a screwdriver, but is worth a shot.
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