Electrical cable conduit - plug for cable conduit in fusebox wall

These things break really easily, also the ones you buy. Here is a replacment that enables replacement of the gland plug that connects the cable conduits to the fusebox. Size 16mm. The threads are M16 x 1.5. Please feel free to make one similar for 20mm size. As these are subjected to some force, you should select a strong filament. I use nylon (PA) for these.