New battery host needed

I have an O-Like 400mW torch I got a couple years back and it is the older design they don't have anymore. So the threading for the end cap has been totally destroyed. Somehow it got cross threaded and it won't budge at all. I have tried vices and pliers and haven't been able to get it off. Now it is pretty much gone for good and it looks awful with me trying to pry it apart. The whole laser unscrews from the center as well so what I need is a new back half part for battery and tail clicky. I have a battery stuck inside of it right now since it is blocked off there from the center too. So does anyone have a spare back half compatible for this laser or maybe I can send the laser out and there is someone who can machine and thread a new back half of this host? I would pay a reasonable amount for this because I really like this laser and it was works just fine at just over 400mW. Pictures attached
are pretty self explanatory. Last image is what I need to find. Thanks to anyone who might be able to help here.

Nobody has any suggestions here? Susie claims she can't help me. I just need a host that will be somewhere around 22mm diameter, end that screws in to existing part at 20mm. Very tight threading... about less than a mm apart.