What type of lubricant is recommended for the fluid needle spring?

The recommended lubricant for the fluid needle spring is a non-silicone grease like lithium due to its excellent properties for lubricating mechanical components. Non-silicone greases provide a reliable, long-lasting lubrication that can withstand the movement and friction present in the fluid needle assembly. They also offer good protection against wear and have the appropriate viscosity to ensure smooth operation of the fluid needle without causing clogging or residue build-up, which can occur with inappropriate lubricants.

Using a water-based lubricant is unsuitable because it may not provide the necessary durability or protection needed for mechanical parts. Moreover, pure vegetable oil could break down over time or attract dirt and debris, leading to potential issues in performance. Heavy-duty machine oil might be too thin and could not stay in place effectively, making it less effective for controlling the movement of the fluid needle in this application. Thus, non-silicone grease like lithium is specifically chosen to ensure optimal functionality and reliability in the operation of the fluid needle spring.