Dredging up this lovely thread as the glue dries on my latest GT mod.
It seems like every time I acquire a BLF GT, it’s only a matter of time until I succumb to the aspheric devil on my left shoulder.
My latest acquisition started out as an original BLF GT. I upgraded it to a BLF GT90 with a Lumintop BLF GT90 driver, an SBT90.2 on a Noctigon 32mm MCPCB, and parallel battery carriers from JLCPCB. In doing so, I also upgraded the springs in the carriers to BeCu, including the top contact springs, which I also improved with a larger screw head that touches the brass contact at just the right spot to bypass the spring.
The 32mm Noctigon MCPCB underside had to be filed to allow clearance for the 16awg wires. I finished it off with a 3d printed GITD centering ring and proceeded to shelf light for a few months.
Since my original GT aspheric mods, I’ve picked up a 3d printer. For this mod, instead of using PVC bits, I designed and 3d printed the necessary parts for aspheric conversion. I found this solution to yield a superior end product compared to the PVC in terms of functionality and fitment.
-Bottom lens retaining ring
This is a ~30mm tall ring that slides into the head of the GT to support the lens from below. It friction fits into the head and has a recessed area that precisely centers the lens within the head. Its height is precisely set to place the SBT90.2 at the focal point of the lens.
-Top lens retaining ring
This ring goes on top of the lens and retains it from above in combination with the stock GT bezel. It is chamfered to hold the lens tightly.
-LED retainer / Wavien collar spacer
This piece is designed to precisely locate the 32mm Noctigon MCPCB and utilize the stock GT mounting screws. It also serves as the spacer for focusing the Wavien collar over the SBT90.2 (1.3mm on my particular printer.) This piece underwent several revisions to ensure excellent fitment and functionality.
Finally, the Wavien collar was attached with shoe goo to the retainer/spacer using my HDMI microscope. The solder joints needed to be flattened to <1.3mm tall so as not to interfere with the collar.
Once the glue holding the collar cures, I’ll measure it.
This is my very last Wavien collar and this light is the pinnacle of my flashlight modding hobby in terms of performance and fit & finish, so it holds a lot of value to me. With that said, if you really need this light in your life, I may sell it for the right price.