I kept fighting with the shutter battery charge connection. After following several different mods I have found this one to work the best.
Materials are:
Copper sheet https://www.amazon.com/gp/product/B08ZMY2DTF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Anti-Backlash springs for 3D printer https://www.amazon.com/gp/product/B085GGJMXH/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&th=1
8" long 2x4
2 - 1/4-20 x 2" bolts, nuts and washers.
