Okay who sold it to KipKay?

[Ehgemus]

I've taken a photo of it, maybe the piece with the lens screwed into it is meant for a press fit and if removed, a module? The reason I didn't think it was for a module is it won't fit tightly, but the set screw will indeed hold it in. Perhaps that was how you designed it. It will hold the module without a problem, but thinking I am doing something wrong or it was designed for something else with the small gap. Maybe the small gap is to allow heat sink material of some kind?

That host should be a 12mm module build.