I found that the frame of 90 degrees angle was broken. The thickness is 1.0 mm.
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Around here, it had been broken before. Why does it have ? The other side haven't had such problem.
Any way, I decided to repair it.
Back side.
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Welded by MIG.
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Then sanded, painted.
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I may make the back frame again. I have to think construction of my new python again.

Around here, it had been broken before. Why does it have ? The other side haven't had such problem.
Any way, I decided to repair it.
Back side.

Welded by MIG.

Then sanded, painted.

I may make the back frame again. I have to think construction of my new python again.