Henry Lupton's design for a filler cap wrench can be downloaded and 3d-printed to protect your filler caps
Winch handles tend to damage the soft material on filler caps and also provide too much leverage, which causes over-tightening. With the current proliferation of 3D printers, one option is to make your own short plastic filler cap wrench. These are easy to draw, but I have placed my design online at www.thingiverse.com/thing:650507
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