Sorry for the confusion. I removed the threaded bush after removing the bumper just to get a photo of it along with the bolt. It was getting dark so I didn't get a decent look inside the bush, but it looked like it had threads at one time. Possibly just the result of the galled aluminium on the thread leaving score marks as I unbolted it.
Can I assume therefore that the inside doesn't have threads, and all I need to do is give it a thorough cleaning?
I had thought about the gall maybe coming from where the bolt met the but, along with 20 years of corrosion, but never checked the nuts on the bumper, as I wanted to get it put in a shipping container overnight. I'll check them out and see what state they're in.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts
My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts
Sold!  2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights
My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds
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