Where do you want to insert the slipper pad?
Wouldn't it be a good idea to use a body reamer for expanding the hole? Of course you would have to expand it carefully and stop at 8 mm.
Edit: I just had a go on a 72 and a 75 tooth AE spur. If you hold the body reamer straight and check the diameter with some calipers from time to time, it seems to work quite well. Of course, it is not absolutely true to the centre, but the deviation is not too big, approx 0.1 mm to max 0.3 mm depending on where you measure, and the pads and discs will help to centre it, too. To be on the safe side, I also ordered some AE slipper pads.
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