Hello
I used a torch and some homemade special tools (one made from an old c-spanner). It is very hard.
Later I read an article in a swedish classic car magasine about how to soften hard aluminum. Use a classic gas welder. Strike the area to soften with a ”black flame” so it turns black. Then heat the metal until the black surfase disaperes.
I have not tried this so I recommend that you will do some testing before you use it on your car.
Regards
Per
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