This Dual Neg Contact is offered for those without metal fabrication abilities to make your Modular Mod build easier. It also adds strength to the Bottom Print once it is screwed and glued in place acting as a laminated part. I've been using 2 part Devcon 2 ton epoxy that is sold in a double barrel syringe at most hardware stores. If clean up is needed denatured alcohol has been my go to for years although be careful the denatured alcohol with fade the dyes used for the 3D plastic print. The use of a 1/4-20 threading tap may be needed and a 1/4-20 threaded brass insert should be soldered to the interior side to receive a D-ring screw. All safety measures, precautions and electrical calculations should be addressed and utilized in the fabrication of this product. Your safety is your responsibility.