Grimrock

Thanks for the ride, folks at AH. Couldn't put it down.
Looking forward to a third installment!

The two solid (bronze?) metal doors near the stairs. I've (I think) completed everything in the eastern section, but can't figure out how to open the west door. Any help?

A hint to this would be great. I am stuck at this point as well. :<

ugh, again! nm. Found it. lol

I have this Gear Key I got on Level 8, but have no idea what to do with it. I'm pretty sure I've completed the level, and have this left over. Do I use it later or something? Or did I miss a door somewhere...

ugh, nm. found it.

So, that long hallway on level 8 with the face spitting the single lightning bolt every few seconds. I got everything, including the secret entrance at the end. However, there is one wooden door in the middle that I can't open. I opened one of them (the one closest to the lightning spitting face) b...

Almost exactly one year, in fact.

Dammit! I thought I looked everywhere already. SO obvious.
thanks!

This is a question regarding the respawning knights with the 'column click' puzzle. I've searched the forum for an answer, but it seems I may have just missed something obvious, since I don't see anyone else having a problem. It's the pits. The pits are all open. I have no idea how to close the pits...