[LostInSp_ce]

Usually when a head has been stripped you have to drill it out. However in doing so you might damage the thread and will have to tap the hole again at the next size up. One thing you could try if you want to avoid tapping a new thread, is to drill a tiny hole in the center of the grub screw and then try to glue a small screw or bolt in there. Just be careful not to glue the grub screw in place. Then you’ll have no choice but to drill everything out and tap a new thread. If done right you will now have a screw that is stuck in the grub screw which you should be able to unthread and remove without damaging anything. Then just replace it with a new 2mm grub screw. This is based on the assumption that you can get a drill in place to do this, if there isn’t enough room for access then you will have to try something else. I hope this makes sense and good luck.