Go by the gunsmith shop, have them hit the lens for a couple of seconds with bead blast media, voila! You might call and see when they’re going to be bead blasting, they like to set up work to get in the blaster and do everything and get out.
Or you could just leave like 3 lenses with them, ask for a light, medium and heavy blast whenever they get around to it. They might not even charge you anything, curious to see what you’re doing with it and such. lol
As you can see, there are 2 different tubes for the BLF Q8 and Sofirn Q8. No inter compatibility because of a slight thread change on the Sofirn Q8 for slightly better waterproofing.
Speaking of baseball bats from a post further above, can three or more of these be connected to a Q8, staying with the 4.2V parallel configuration? That would be a beast of a light.