Heidelberg qm 46/2 plate clamp problem (plate slips out)

Hello, i run heidelberg qm 46/2 press and i have this problem, i mount the plate and after short run the plate slips out off the plate clamp. can somebody help me with this problem??? (i have attasched picture from the plate, the right line is when i inserted the plate, the left line is after short run.)

 

clamp springs need rebuilding is my GUESS....you can try putting some ink on the back of the plate to keep it from slipping

 

Anyone have spare parts for this clamp? i want remove clamping plate replace