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This print is offered as a replacement or alternative to the complete kits offered in my shop. These battery cylinders work in conjunction with the Cage print which is the center piece of the Modular Mod design.
The suggested spring mounts with a screw and washer in the top of the interior of the battery cylinder, a ring terminal may also be used for electrical connecting or a 2% silver solder can also be used to connect wires directly to the spring which has been my preference.
Here is a listing for the suggested spring or contact me I have a few in stock at the moment. This spring is best used with flat top 18650 batteries although a slight bend of the contacting spring wire can make the springs suitable for button top 18650s as well. http://www.leespring.com/ Part Number LBC 038A 01 C
If your intended build is a bottom feeder mod or Squonker this battery cylinder can be modified to be you bottle housing although I should have a bottle cylinder listed any day. All safety measures, precautions and electrical calculations should be addressed and utilized in the fabrication of this product. Your safety is your responsibility.