My brother had a diesel smart car a few years ago. One of the glow plugs. You needed a special extractor set to get it out that was worth something like 800 bucks from the dealer.

It had 4 or five pieces to it, nothing particularly extravagant. It was about 10 ounces of steel in total, you could make the whole set yourself in about an hour with a lathe and milling machine, if you were set up for it.

Total ripoff. I told him he should go into business knocking off those sets and selling them for $150. He could make a fortune just fucking around in his spare time.