Wellby

"Well, it would appear that once the capstone is moved more than a few inches, a stone weight will be dislodged, causing the stone disk to spin. I'm not sure what that will do, but it would probably not be healthy.

"I believe that I can disable it by cutting the thread that will pull the wedge loose, but even so, we shouldn't move the capstone more than necessary. Who knows what will happen if that copper wire is severed?"

If no one objects, Wellby will carefully reach through the gap and sever the thread connecting the capstone to the wedge.

Spoiler
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Disable Device with masterwork thieves' tools: (1d20+20)[27]


( P.S. Fixed my character sheet links. TTW moved things around. )