Even though it's low on the priority list, it's been bugging me that the locking gas cap doesn't lock. (Then again, considering current gas prices, maybe it's not such a low priority.)
First off, I set out to make a key for the cap. Although still in business, the manufacturer of the cap, Waso, is based in Sweden, and locating a correct key blank (WS-3) proved difficult. Luckily, the folks on Brickboard listed a few compatible blanks including the Ilco YU1-X153 blank (intended for Yugo!). The Yugo blank is a little longer, but fit just fine after filing about a millimeter off the tip. After filing and fitting and filing and fitting, I had myself a usable key!
At some point, someone removed the guts of the lock, so I had to manufacture a new "bolt" from scratch.
something missing here...
The hardest part was figuring out what the missing part was supposed to look like.
FYI, 70's-era SAABs appear to use the same five-sided Waso caps.