ZZ, there might be some debate as to how you should secure the needle valve assy. back in. One thing is for sure, the parts have to be meticulously cleaned. Soaking in a jar of solvent that is taped to a orbital sander will sonic clean everything, or you can use a denture cleaner. Locktite has a formula for this application [permanent]. The little orifice should face the reed. I like to take it a step further and make an upper NV support that packs the NV seal tightly, so the needle is hard to turn. You will get very consistent runs this way.