Glow plugs - the trick with them is to do them when the engine is hot. Means you have to work quick to get the intake manifold stripped off after the engines been run for a while, but that's the best way. And always tighten them a smidge before loosening them. That's just a generic statement about parts like that anyway.

I know your situation - I don't have a workshop anymore either. Everything I do is in the open air, and it SUCKS!

With regard to parts, any mechanic should be happy for you to supply your own parts. Make it clear that you will supply all the parts you are able, and that obviously you don't expect them to warrant the part - just their labour. If they are legit, they should have no probs with it. After all - it could very well mean they get MORE Business out of you, rather than less.

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Cheers,

Anthony