Rope Threading Tool & Cord Lock

I wanted to replace the drawstring on my pants, so I made this threading tool, and also made this cord lock.

The buttons on both sides of the cord lock are threaded in and seated in place, with a compression spring positioned in the middle.

Their sizes are as follows:
Rope Threading Tool: 120 × 8 × 4 mm
Cord Lock: 34 × Ø12 mm
Compression Spring: 0.5 × 5 × 25 mm (Bambu Store Code: BB004)