Plastic NDS sleeve of UN 26 BB may be inert* enough ,
so thread filling with a loc tite product [like 609]
wont bind with the plastic the thread in from the drive side cartridges
only have a little stability gained by the sleeve on the NDS, so its less crucial..
* wax like mold release spray can coat things to not stick to them..
used in fiberglass layups.. in molds..