twisted tail piece

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If the 912L was shipped after February 28,  2011, Check the installation instructions, step 3 to be sure all parts are installed on the trim correctly, even if the trim was received in th...
Q330-168 SFIC Tailpiece (throw member for levers) Q330-169 SFIC Tailpiece (throw member for knobs) 
Refer to Table 1 for a list of T lock tailpieces for conventional cylinders.  Table 2 shows IC tailpieces. Table 1: T lock conventional tailpieces Table 2: T lock IC tailpieces
 The tailpiece of the rim cylinder can be inserted into the Von Duprin 98/99 rim device either vertical or horizontal.
Below is the link to the document that shows how to install the AD993 tail piece assembly: Reinstalling an AD-993 Tailpiece Holder Assembly