Look Sekretmastera video on how to make the scratching post. Base necessarily solid wood or particle board, size ~ 500x500 mm. Post - cardboard tube from linoleum or radio antenna (as here). For strength - check! - Cardboard tube is glued into the hole bottom.
Winding held natural rope - this is the most time-consuming part of the process. Kittens of this size get cheaper stores and most importantly stable - the cat can not topple it and durable - lifetime warranty))).
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