Handle STL
Housing STL
Lid STL
Heatset Nuts 1/4-20 USA Ship
1/4" washer
3d print washer
1/4" x .75" set screw
Source II
or use cap screw
Need to modify holder for cap Screw.
KIT
Screw Sizes
USPS allows 1 gram per cell 2 grams per battery
Battery is 600 mah
600/1000*.3 = .18 gram