Hey, Red. I purchased several of those brass lens holders for aspheric lenses. Do you happen to know how long the barrel is on them? I have a lot of different FL lenses that are loose and was wondering how much threading I have to work with.
The ones I received I bought for 99 cents each, they have the brass barrel with the silver retainer and they are 9.5mm long by 9mm wide, that is they are the standard M9 x 0.5 and 9.5mm long. The 99 cent barrels retainer has a smaller retainer hole that could be an issue with highly divergent diodes, I use the Sanwu G2 with C-lens builds as it's a shorter FL and has the widest openings.
---edit---
I have one in use with a BDR-209 and it is long enough with a thumb wheel.
Here is a DTR G2 next to the 99 cent empty barrel.
The retainer on DTR's barrel has a wider opening, but as small as the beam exits the G2 it's not an issue, maybe on the more divergent diodes such as the 44 and mitsu 638 the retainer hole may need to be drilled, actually I have been using Sanwu G2's for my C-lens builds and they have a wide opening.
The Sanwu G2 lens actually sticks out a little at it's center, it is a shorter FL lens than the standard G2 as I demonstrated in a couple of videos before and this is why the Sanwu G2 works with the 3XBE along with a 6X C pair where as the standard G2's beam over expands inside the 3XBE after 6X-C lens correction but the Sanwu 6X corrected beam fits the 3XBE, granted a bigger/wider for it's power BE could be used with the standard G2 but why, I would use the Sanwu lens anyway, also BE's that wide for low power are hard to find, truth is Sanwu made these for our favorite MM diodes.
Look at the Sanwu G2 on the right, you can see light from underneath because it's lens is the only one that just touches the table at it's center.
THESE ARE ALL OUTPUT ENDS.
Sanwu really stepped up with some great affordable optics, their G2, G7, and 3XBE are fantastic.
-----edit------
DTR G2 entry vs. Sanwu G2 entry