Maybe the props were a little bit special geometry which made the glass break.
I am trying to build the mast clamp for 63100 with gong foil. I think it was too tight:
I print this with PETG 0.2mm layer height, 0.4mm nozzle, 250°C/80°C at 27mm/s, almost no cooling.
Maybe i still can use the part with a single screw through the crack? Some more sanding on the interface to make it fit better.