Standoffs? I don't know what these are. What do you mean by "hold the screw in place on the opposite side"? Do you mean the corresponding screws on the top (or bottom)?The Luna's use two female/female standoffs. Yours just spun because the screw/standoff on the opposite side was spinning. You didn't bore out the hole and you didn't need Loctite. All you needed to do was hold the screw in place on the opposite side and it would have screwed in perfectly.
I thought the same as you with mine. Until I discovered the standoffs. Once I knew those were there all good.
If you dismantle it just remember the standoffs are there. Easy once you know they're there.
I'm such a dummy when it comes to this stuff.