Black Decker 20V max to 18V Tool Adapter

Build video:
https://youtu.be/EZE7LqASFk8

This will adapt a Black and Decker 20V max battery to a tool that takes the 18V nimh batteries. I provide templates for the brass parts that need to be cut from .8mm brass sheet.

Their is a commercial product that does this but it's not available on Amazon as I write this:
https://www.amazon.com/gp/product/B07VGFR9MS/ref=ppx_yo_dt_b_asin_title_o05_s01?ie=UTF8&psc=1

It requires a few hardware components to build:

3mm X 1mm Button Head Cap Screws
https://www.amazon.com/dp/B08H2GQDMK?ref=ppx_yo2ov_dt_b_product_details&th=1

.032" brass sheet (.8mm) . I got it from Hobby Lobby

spring from a Harbor Freight spring kit 32mm X 9mm