Needle Valve Knob Improvement
After using a certain brand of needle valves for a few months, I came up with an idea for an improvement that I wish the manufacturer would have thought to implement. Notice that the brass control knob is very smooth, which makes it look great. However, having the surface roughness extremely low makes it difficult for the user to make small adjustments, especially if his or her hands are damp from doing tank maintenance. To fix this problem, I made an aluminum knob that slips over the stock one with a set screw(not visible in picture) to secure it to the existing one. The knob I made, on my metal lathe, has a knurled finish, which allows the user to easier get a grip on the knob to make small adjustments. In order to keep cost down and still provide the intended function, aluminum was used instead of brass.