How to install the stairs on wooden structures.
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Drill a hole, 8 millimeters wide
Insert tags in drilled holes and to hit the step lightly from above.
Drill the hole in the wooden step φ 14 to a depth of 25 mm.
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To press dowels into the wood structure and to drive in a screw.
To put glue on the wood structure and dowels.
To fill the step to dowels and the wood structure