On Sun, 28 Jul 2013 17:05:04 -0700, W. eWatson wrote:

I tried using penetration oil to dislodge the screws, but to know avail.
Any suggestions?

I only know the classic top-ten solutions to stuck nuts & bolts:

1. Penetrating oil (you used that already)
2. Tapping (because kinetic friction is less than static friction?)
3. Heat (expansion and contraction may break chemical bonds?)
4. Leverage (a longer stronger allen key can move the world)
5. Impact drivers (I don't see how you can fit them in here though)
6. Screw extractors (I don't see how you can drill the center though)
7. Nut crackers (I don't see that you can crack the head here though)
8. Oversized tools (which works when the heads are stripped)
9. Saws (to cut off the head of the bolt)
10. Drills (drill out and retap the bolt hole)

Given your situation, I only see the first 4 standing any chance
of fitting in your narrow confines.