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There are early and late concentric configurations. The early had a shorter main jet holder and used the three ID ring (not the clip grooves, shallower rings above them) and the later used the longer mainjet holder and the shorter two ID ring needle. The early carbs had a needle jet that doesn't have the air bleed holes cross drilled in the hex flats. Later ones have the bleed holes.
It isn't uncommon to have the needle push up into the spring and get hung up when installing a slide in a TR6. The needle can hang up on the edge of the needle jet. The best way to install it is with the air filter chrome ring off, then you can use a finger to align it.
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Triumph old, Triumph new, any Triumph will do.
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