Hi Michael,

you wrote: "Use window selection (where you click in an empty area and then hold down and drag to make a selection rectangle) to select the inner piece in the boolean difference command, since it is not easy to click on it since it is contained within the main piece."

Unfortunately I was not able to select the inner piece using window select (covering the entire object with the selection window).

Could you please explain more detailled how to select the inner piece?

thanks & regards
Jurgen