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Wire binding screw for lug kit AL175JD. What is the larger wire binding screw for in AL250JD, for smaller wire range of 4 - 4/0 Al or Cu?

Issue:
Wire binding screw (WBS) for lug kit AL175JD.  What is the larger wire binding screw for in AL250JD, for smaller wire range of 4 - 4/0 Al or Cu?

Product Line:
Powerpact J frame

Environment:
AL175JD
AL250JD

Cause:
Digest 176 page 7-23 says in a note for the J frame breaker:  "AL250JD wire range is 3/0 AWG–350 kcmil Al or Cu. For smaller wire range (4–4/0 AWG Al or Cu), replace the lug’s wire binding screws with the larger binding screws provided."

Resolution:
48910-002-20 is the part number for the WBS for lug kit AL175JD.   And this is also the part number for the WBS mentioned in the digest note above which installs in AL250JD lug to acheive smaller wire range of 4-4/0 Al or Cu.
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