Yup, you need that little aluminum bushing to be loose on the threads and to be a loose fit into the carb body. Quite often they are corroded into the bore making them a little bit tricky to remove. The bevel on the bushing must face out, towards the new packing washers. If the threads feel tight or have any resistance, they will need chasing and are usually 1/4 X 40 pitch.

When installing them, I like to thread it part way up the needle and then snug up the packing gland until I can feel the needle starting to tighten up. Then the needle can be turned in gently until it bottoms out before backing it out several turns before tightening the packing gland some more. Keeping the needle backed out while tightening the gland will prevent it from bottoming out and damaging the needle tip and its seat. Once the needle feels snug enough, it can be bottomed out again before setting the initial adjustment.

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