1777 J. Ramsden 7 The screw S is prevented from unturning by tightening the finger-nut (w).
1825 ‘J. Nicholson’ 322 Screws..which are prevented from unturning by tightening the finger-nuts.
2004 R. Miller et al. (ed. 4) vii. 110 (table) 8-inch (203 mm) centerset trim plate kit for EBF-85 or EBF-187 faucet (faucet only); includes two finger nuts.