17mm to 20mm driver adapter?

[LowLumen]

Some grinding required, but JohnnyMac has a fix for you here:

Adapting 20mm driver pill to 17mm

I just got a UniqueFire UF-V3 and while it is an awesome little performer, it is way under driven (1.74A on high). Obviously I want to replace the driver but the pill in this light only takes 20mm drivers. This poses a problem as there are no 20mm drivers I know of that meet my needs. I first thought I could just place a 17mm driver inside behind the 20mm driver but the space inside the pill is only 4.5mm deep. Besides, being an all aluminum pill, soldering a good, dependable ground to the drive…

Worked out well on my UF-V3.