No offence but it sounds like something you're doing wrong if it's happened twice to you.
It's been 9yrs so I can't remember exactly what the issue was with the screws that time, can't remember if it was stripping of the screws or something else. But managed to get those out, this time looks like I'll be beaten by a stubborn screw.

From the pictures you posted earlier, both screws look to have more than enough metal left that a decent fitting screwdriver will easily be able to get them out. Do you live anywhere near Gillingham (Kent)? if so, bring the card over this evening when I'm home from work and I'll be more than happy to try to help get the screws out by finding the right size of screwdriver and using that to get them out.

