Took LetuBotV4Rex's perfectly contoured clip and added holes to mount to benjamenjohnson's ToughBuilt ClipTech Mount https://3dprints.electronsmith.com/version-2-toughbuilt-cliptech-tool-pouch-mounts/. Added teeth too instead of the "belt clip", but not sure if they really do much.

2x 3/4" 8-32 bolts/nuts required - they will stick out into the clip, helping secure it to Milwaukee Packout tool bags. Just don't tighten the bolts until the clip is on the bag. They tend to stay on unless you're trying to rip pouches off and not hitting the switch - but a 7/8" screw in the top will really clamp it on.