Here's a shade tree project that's kept me occupied for couple three hours (!). My favorite riding mower blew it's transaxle...check this out. An internal screw backed out of a gear, snapped off and got caught between the gear and the aluminum housing. You can see the screw embedded in the lower housing here (an internal view)...

A view of the housing, from the outside, showing the screw head clearly visible...

Macro shot of the screw, internally embedded in the housing. Note that the gear had begun to eat away at the screw. The gear is hardened steel, much harder than the screw, but it still shows signs of a struggle.

Here's a closeup of the screw head just about driven through the housing. Note the stress fractures...I'm lucky the housing didn't erupt into twenty pieces.

I removed the screw, and sealed the housing. Goes back together tomorrow, probably, just in time to mow again.
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