Take a philips screwdriver and gently tap the end with a hammer, drive the tip into the allen opening and try to create new grooves or a cross pattern that will grip the tip of the screwdriver enough to unscew it.
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The screws on the D6 are supposed to be star, not allen. But when I had mine, a star wouldn't work and I had to use an allen. Pacific Valve was very suprised. Anyway, try a star before trying anything else. Oh - also, allens come in metric and US sizes, so you may have the wrong allen. Good luck and don't worry - stripped screws can be removed. Electronic repair places deal with that all the time if worse comes to worse.
Any reasonably well-stocked hardware or auto supply store will have what is called an 'easy-out' or screw extractor. It's a tapered bit with sharp fluted reverse threads. Buy one that is the right size for the allen screw recesses, along with a T-handle chuck to hold the easy-out, and the screws should come out 'easily.'
I agree that I wouldn't tap anything into the screw head but using an easy-out should not involve having to tap it in if the right size easy-out is used.
The taper of the tip of the easy-out is likely extreme enough that the flutes will bite into the sides of the recess when the handle is turned counter-clockwise. I'm not guaranteeing it will work but it's an inexpensive experiment and won't make the situation worse if it doesn't.
If the screws are not recessed, and you have replacement screws available, I recommend you buy a Dremel, and with the cut-off wheel attached, carefully cut a flat slice into the top of the screw so you can remove it with a flat-blade screwdriver.
Just hold onto the Dremel for dear life so it doesn't walk off the screw and cut your unit top.
I've normally have found success without having to go as far some of the above suggestions, even if they are salient.
What I recommend you try first is to switch from metric to SAE or vice versa. More often than not, you can go up a tad in size for the wrench, and get enough of a grip on the bolt to remove it.