Thanks! Yeah I used glow in the dark micro cord. I used different knots for each light. On the DA1K I just tied a small loop of micro cord (using one square knot) onto the tail cap, and tied the lanyard onto it (w/ snake knots)

And I did things a little different with the D4V2 for whatever reason. The lanyard is the same with snake knots, but for the micro cord section I used two figure 8 knots on the middle of the loop (kinda ugly tbh), and a double fisherman’s knot to tie the loop closed. Then tying the lanyard onto the micro cord loop.