I really appreciate for thoughts and comments. With this design,"Needle Spring Lever" is a great solution but I found there is much better design and approach which I prefer to manufacture. It's easy to manufacture and to form than a wire spring. Once fitted, it even holds the float and needle in place from falling off. This time, I used a 0.2mm brass shim formed into a metering lever or a needle valve lever as a prototype. Same idea with the wire spring but slightly more rigid to hold the needle crown head. I welcome your thoughts and comments. Please see attached photos of the prototype and my hand written design measurements.
