From The Mediator (microfilmed from 1917-1919; on the same reel as The Jewish Bakers Voice), 8 August 1919, pg. 12, col. 1:

 K in Knisch as in Pigs Knuckles

It is pronounced, or, better, they are pronounced  k-nisches, the accent being smeared impartially over the k , as in the word k-nuckles, when used in connection with pigs knuckles.