Hi snapped my key off in my UPVC door lock (CES eurolock). We tried everything to remove the broken key but had no luck. We took the pin out of the side of the door in the hope of removing the lock but the key has not turned it into the correct position. So we are trying to drill through it and replace it. Four drill heads later we are having no such luck. We don't want to pay out the £100+ quoted for a locksmith. Should we just keep drilling and if so will we break the door lock mechanism altogether???