part number for drive screws

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The part number for 98/99 series NL Drive Screw is 970441-89. The NL Drive Screw is also available in package of ten, part number 090074-00 NL Drive Screw can't be substitute with a standard sc...
You must use the drive bushing that is supplied with the 179L control trim.  It is different from teh 1790 bushing.
Step 3 and 4 of 179L Instructions will show the old drive bushing being removed & the new drive bushing getting installed
The part number is K110-020 (includes 2 screws).  You will also need to specify the finish.
B500 with standard cylinders How to order with the deadbolt: Door thickness over 1 3/4" to 2 1/4", specify door thickness when deadbolt is ordered Door thickness greater than 2 1/4" will req...