Shortest 18350 batteries?

I finished building a Sinner Ti 18650 tri-EDC with MT-G2, using a modified slim copper pill, modified S2+ reflector and BLF17DD-Z, I removed the spring and replaced it with a 1mm brass pill. However even after all these space saving mods the light won’t fully close by only 1.5mm.

I’m using purple efest 18350 flat top, does anyone know of a shorter 18350??

If you are still using a spring on the switch—maybe cut a couple windings off—I put dents in my purple 18350 by over tightening in a light similar to this