impossible to apply the diffuse connection

[Candelazzi]

Hello, everyone. I have already sought another discussion with my own problem and found it but I have not managed to solve it anyway. the point is that (as from the title of the discussion) I can not tell all the edges as I would like. I am creating a chessboard and the piece that gives me problems mainly is the tower: I can't pick up the gushes. I'll attach the image of the detail so you might understand better. as you see in the left eyelash I had no problem, but in the central one where I looked in black the edge, I can't tell. Can you help me?

thanks for the answers.

 

[lattu]

Why don't you copy the piece already collected?

 

[xxfast]

If you put the file, maybe see?

 

[Ezio Olivato]

Why don't you copy the piece already collected?

You know what?