Comment on heat. I never use an Acetylene Torch on this sort of thing. In fact if I had one working I could have used a small handheld butane torch on that area. The Propane Torch I used was a large for the job and in this case I was lucky that the tank is nearly empty because I was able to get a small sable flame with not a lot of pressure behind it.

I have 2 electric heat guns I used for stripping paint and they get hot enough to help but spread the heat over too large of an area.

I have an Acetylene Torch Set That I bought back in the 1970's and used it only once or twice after I cut up a car with it. Since that time I am not sure where my Gauges are for it and even if I could find all of the set I am sure my hoses likely have rotted out. Since that time I have not ever needed that much heat.

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84 300D, 82 Volvo 244Gl Diesel