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| First I made a template defining the correct angle of the seat inclination. The guide rails have to precisely fit behind frame 5. |
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| Guide rails milled from brass and files to the correct dimensions. |
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| Top view of the guide rails and frame 5 segments. |
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| I soldered stripes on top of the H-profile. |
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| One profile is already cleaned up. The holes are to lock the seat in 6 different height positions. |
