So many answers! Thanks all! : - )

Pilou… thanks for mentioning the apps. I will look at them.

Stefan… it is strange to me, indeed, that you acquired such a shape so easily. I still have difficulties to acquire it with the first filleting attempt only.

OSTexo… you should make a tutorial… it would be very helpful, for sure. : - )

Michael… I will make some other tries too for detecting my possible faults in handling such cases and if the problem persists I will send you the files.

Thanks all again! : - )