A handle taken from a worn-out faucet, drilled out and threaded for a bolt, makes a good wing nut. A discarded gas-bracket key, cut off on the line AA and with the part within the dotted lines filed out, then drilled and threaded, also makes a good wing nut.

Wing Nuts Made of Discarded Parts Taken from a Faucet or a Gas Bracket

Ill: Wing Nuts Made of Discarded Parts Taken from a Faucet or a Gas Bracket