I've got a 2010 Defender 90 and the bonnet keeps popping open onto the safety catch. I've adjusted the length of the pin, the position of the locking mechanism plus the two rubber stops and I still can get it stay close. It clicks down but will pop up due to road vibration on the move or if you manually try and shake or pull the bonnet whilst stationary . Any suggestions ? Do I need to change the pin or locking mechanism . Thanks