I needed a replacement bulb base.   These are great lights.

If you lost your spring you will need a spring… I am using two.. a large one to make contact with the negative ring and the other to fill the gap.

Including the scad file if you want o mod it.

I have seen this bulb sold under AIYEGO or Viewpick names

Outdoor / camping item you may want to use PETG or some other heat / UV resistant material.