The connections turned out not so good. So I desided to improve them with selfmade filler. I made it from birch sawdust and pva. The connections became better. But the filler became very noticable espetially after covering by leenseed oil.
Sanding did not help much because the filler penetrated deep into wood. I am little bit disappointed because I was going to post this step stool as a project. But now I hesitate.
Tomorrow I cover the stool with liquid wax but from my experience it will not change its appearance (may be I am a poet?)