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Adding 3p breakers to an NQOB
The kit has A , B and C phase connectors and screws and the A & C are symmetric. The latest version with hex head B phase connectors is very difficult to install if not impossible. Due to the close proximity of the plastic insulators on either side of the connectors, there is no room for a wrench or nut driver. Perhaps by inserting a screw into the top of each B phase connector , they can be slowly driven into position . Turn one hex head standoff 1/4 turn , then the other 1/4 turn , and repeat the process until they are both tight. Then install both breakers together . Here are the directions written on the envelope of the SK5668:
Replacing the interior with an NQ in the existing box or a complete panel changeout to a new NQ package is most likely the best choice. Another option is to find an old SK5668 with round standoffs.