Araldite works for Hydra and SMIDSY's electronize switches. Just make sure you wipe both surfaces with meths before you stick it down and it's fine.

If you still want to drill you will need a low speed pillar drill and a cobalt drill of the right size.

I have found Hardox will break any drill below 5mm. 5mm and 6mm drills go through just nice and then you can ope them up with a 10mm drill just nicely BUT you do need to be running the drill at about 250rpm, have cobalt drills and have a drill sharpner.

Andy