Axio, I was just looking at a photo of the HFCs. That extension tube is actually pretty small/thin. If you stuff a small wad of SS wool in there, I doubt it's going to go anywhere. There just isn't enough space for it to move around. What I'd do is stuff the wool in just a little, then allow the O2 sensor to push it the rest of the way in as it's being tightened (vs. pushing it in with your finger or a screwdriver).
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"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.
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