Chasing down a boost leak a couple of weeks ago we realized the leak was coming from the spring where the blade/shaft goes. I assumed it was just an old TB and ordered a couple to replace the old unit. The first replacement we installed leaks in exactly the same location; the other hasn't arrived yet. Upon disassembling the first TB, it appears that the sealing is handled by a circular spring/coil. Is there any sort of rebuild kit or service to fix these? I couldn't see any way to put an o-ring in there.
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