Used this motor in a Pro 54-3G casing. Spacer and delay assembly were ejected through forward bulkhead/centering ring and resulted in the spacer "absorbing" the steel quick link and eye bolt. Motor casing ejected out bottom of rocket, with propellant grain still intact.
Vendor on site (Good Luck Rocketry) replaced casing, closure, and spacer. Have some photos of CATO.