I recently experience a CATO on the pad using a Cesaroni 54mm 2-Grain Skidmark motor. The forward closure was ejected through the motor casing and out the top of the rocket and the recoil smashed the retaining ring against the launch pad standoff (I got a pretty spectacular photo sequence of the event!). It turns out that aside from the motor retainer assembly needing to be replaced, the rocket is fine. After a little motivation with a hammer and screwdriver, I managed to get the reload out of the casing. I found a little wad of some "debris" inside the nozzle. It almost looks like masking tape or a plug of some sort. The only thing I inserted into the nozzle was the e-match, so this was inside the reload when I purchased it. Does anyone know if something like this is a component of a Pro-54 reload ? Has anyone else seen anything similar? My theory is that this wad of debris plugged the nozzle and created enough back pressure to blow the forward closure out. Any thoughts ???