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Hi there, I'm a brand new member and haven't poked around the forums much yet, so I apologize in advance if my etiquette is poor and I welcome all suggestions for improvement. I caused myself a pretty straightforward problem today. For background: We had warranty service on our Thermador range years ago, and I watched the technician unscrew the venturi tubes from the brass burner bases to remove the drip tray to replace the main control board. What happened today: The wife has been wanting to give the drip trays a good cleaning for a long time, so while I was dealing with another issue, I decided to remove the drip trays for a good soaking. I got one of the venturi tubes unscrewed with considerable effort, but on the second one, I ended up breaking the orifice (or jet) holder that it screws into. It looks like I'll need to get a different drip tray off in order to secure the broken holder and get the venturi tube off to replace it, but all the venturi tubes feel pretty seized and I'm worried about breaking more of them. It looks like all the replacement parts I need are pretty easily available, so I think I just need advice for removing the venturi tubes safely. They just backed out without any problem for the service tech I watched, so I'm guessing the years of heat cycling have caused some corrosion buildup on the threads. Anyone have suggestions other than soaking them in penetrating oil for days?