[lepton]

Yes they are. And often in areas that once the assembly is complete very hard to access.

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Kind of like that $15 gasket in the middle of your engine that costs about $1200+ to have the engine pulled, disassembled, reassembled, and reinstalled?

[rktman]

Or perhaps like a power steering pump on a Volvo s80 V8 that the intake manifolds had to be removed to access one friggin bolt. And NO aftermarket pumps anywhere. Strictly from Volvo. Repair the old one? Yeah, right. No chance of that these days. Oh well. :-)