I removed the old threshold, it turned out that the gutter connecting the threshold to the body had rotted.
I had to remove the lower guide of the sliding door.
I curved a thin stainless steel gutter and replaced the rotten one.
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Then I attached the new sill to the body top and bottom with self-tapping screws.
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I set the threshold so that it covers the bottom edge of the door from below and protects it from road dirt. This prevents the bottom of the door from corrosion.
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When I removed the threshold and the gutter, a picture of body corrosion was revealed. I cut out all the rotten places and installed fresh iron. What was at hand.
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On the back side of the opening, I also had to cut and cook, but this did not get into the frame.
Then I welded everything with electric rivets - welding of thin parts through the hole.
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