Recently the battery clamp nut sheared off on our car and I was unable to tighten the clamp on the positive cable. I went to the dealer for a replacement and found out that it is only sold with the cable at more than $85 and I really didn't want to cut the clamp off and use an Autozone one. I have a fix for this in case it happens to anybody else. VW sells one that works part# 6X0-915-138 and costs about $10. This worked on my positive cable, but it looks like it is the same on the negative.
Sorry no pictures and it is all assembled. It is the 10mm nut on the clamp that tightens onto the battery post. Underneath the nut is a metal wedge that pulls the clamp tight onto the post when it is tightened. Seems to be a common problem
Thanks for that info Batrugger! My sister just had the same problem on her Mini. The Mini dealer wouldn't sell the bolt on its own. They said they could "special order" the bolt AND cable for $150, while the BMW dealer had them in stock for $280. A quick web search found this page, so she went to the VW dealer and got the bolt for $12.50, no cable purchase required!
I found a few weeks ago that my positive terminal clamp (the same one pictured above) had stopped holding firmly to the battery terminal. I started to really torque down on the bolt when I had a sudden jolt of wisdom (no idea where it came from) and stopped myself before I could shear the bolt. It had hit bottom and couldn't tighten up any more... almost like the terminal was a bit smaller than it should be. I stopped at a local Autozone to get a new clamp (I was going to cut the wire, peel a bit back and install a new clamp), when I came across a perfect solution. For $1.50, I bought a battery terminal shim... a small cap that looked like a small, maleable thimble. I removed the OEM clamp, put the shim down over the terminal post and then re-attached the clamp. The shim made the post a bit larger and the old clamp worked like a charm! Every time I replace the battery, I think I'll slip these little gadgets on, just to be safe. [ame="http://www.amazon.com/Pico-0843PT-Universal-Battery-Package/dp/B001QRTXCM/ref=sr_1_3?ie=UTF8&qid=1339440158&sr=8-3"]Amazon.com: Pico 0843PT Universal Battery Top Post Lead Shim for Worn Posts 2 per Package: Automotive@@AMEPARAM@@http://ecx.images-amazon.com/images/I/41D0LARjHQL.@@AMEPARAM@@41D0LARjHQL[/ame]