Green’s Dictionary of Slang

the hand; often in pl.

1906		E. Pugh Spoilers 37: ‘By my cadaver!’ the other made terse reply, ‘if you put your daddlers on her again, I’ll set such a mark on you—’.
1912		E. Pugh City Of The World 258: He did. Not with his own soft, ladylike daddlers, of course.
1928		Framlingham Wkly News 8 Dec. 3/7: Thieves’ Dialect [...] A pickpocket’s hands are his ‘daddlers’ or ‘dips’.